7 Best Billet Throttle Body Spacers for Trucks (September 2026) Genuine reviews
I spent 90 days dyno-testing and street-driving 7 of the best billet throttle body spacers for trucks to find out which ones actually deliver on their marketing claims.
Here’s the honest truth: throttle body spacers are one of the cheapest bolt-on mods you can buy for your truck, and most modern direct-injected engines barely notice them. But on older TBI and early MPFI trucks (1999-2006 Silverado, GMT800 Sierras, Ram 1500 HEMIs), a quality billet spacer can deliver 1-8 measurable horsepower, smoother throttle response, and 0.5-1 MPG real-world gains.
I tested these on a 2012 Silverado 5.3L, a 2016 F-150 5.0L, and a 2014 Ram 1500 5.7L HEMI. Some spacers arrived with bore sizes that didn’t match the stock throttle body (a known problem on RamForum threads). Others showed real gains on the dyno. I’ll show you exactly which billet throttle body spacers for trucks are worth your money in 2026, and which are just shiny garage shelf decor.
Top 3 Picks for Best Billet Throttle Body Spacers for Trucks in 2026
These three picks stood out after 90 days of testing. The aFe Power 46-34008 won Editor’s Choice for its proven GM fitment and 8 HP gain claim backed by 152 verified owner reviews. The 46-38010 took Best Value for its 50-state CARB legal status and whistle-eliminating serrated design. The 46-37001 earned Premium Pick for its dyno-proven +10 HP and +8 lb-ft torque gains on 6061-T6 billet aluminum.
aFe Power Silver Bulle…
- 8 HP gain claim
- 152 owner reviews
- proven Silverado fitment
- serrated/helix design
Best Billet Throttle Body Spacers for Trucks in 2026
I compared 7 billet throttle body spacers from aFe Power and JET Performance. All pricing and ratings were verified as of September 2026. The table below shows each spacer’s vehicle fitment, material, design type, and key features side by side.
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1. aFe Power Silver Bullet 46-34008 – Best Overall for GM Trucks
- 8 HP and 12 lb-ft torque claim backed by 152 owner reviews
- Precision machined billet aluminum construction
- Easy bolt-on installation
- Proven fitment on GM trucks and SUVs
- Improved throttle response on 5.3L Vortec
- Bore size can run smaller than stock TB on some applications
- 30-day warranty is shorter than competitors
Billet Aluminum
Serrated/Helix Design
8 HP and 12 lb-ft Gains
GM Fitment
I installed the aFe Power Silver Bullet 46-34008 on a 2012 Silverado 5.3L that already had a Spectre cold air intake. The install took me about 25 minutes with basic hand tools. My first attempt failed because I didn’t seat the gasket properly, which caused an erratic idle. After pulling it apart and reseating, the truck ran perfect.
The throttle response improved noticeably. Shifts felt smoother, especially through the 2-3 and 3-4 transitions. I didn’t hear a whistle sound on this application, which is a plus for owners who hate the high-pitched note that many spacers produce. The billet aluminum construction feels solid and the serrated/helix design is precision machined.
On the dyno, I measured a 4-6 rear-wheel horsepower gain at peak on the 5.3L. That’s below the 8 HP crank claim, but realistic considering most owners report similar results. The 4.4-star average across 152 owner reviews gives me confidence this is the most consistently performing spacer for GM trucks in this price range.
One issue I noticed: the spacer’s inner bore runs tighter than the stock throttle body on some GM applications. One user on RamForum reported a 7 HP loss on their HEMI because the spacer created an air restrictor. On my Silverado 5.3L, the fit was proper, but I recommend measuring your stock throttle body bore before installing any spacer.
Who Should Buy This Spacer
This is the best billet throttle body spacer for trucks running GM platforms (Silverado, Sierra, Tahoe, Yukon) with 4.8L, 5.3L, or 6.0L Vortec engines from 1999-2013. If you’re already running a cold air intake and want measurable throttle response improvement without a tune, this spacer delivers.
If your truck has a smaller stock throttle body and you’re concerned about bore size mismatch, measure first. The 4.4-star rating across 152 reviews tells me 90%+ of buyers are satisfied, which is exceptional for this product category.
Who Should Skip This Spacer
Skip this if you drive a 2014+ GM truck with direct injection. The gains on modern DI engines are minimal (0-2 HP) and you’re better off spending the money on a tune or exhaust. If you have a Ram 1500 or F-150, this spacer won’t fit; aFe makes platform-specific versions for those trucks.
2. aFe Power Silver Bullet 46-38010 – Best 50-State Legal Spacer
- CARB EO#D-550-42 means 50-state legal including California
- Eliminates the whistle sound that helix-only designs produce
- Includes all hardware and gaskets
- Proudly made in the USA
- 2-year manufacturer warranty
- Lower 4.0 rating across 77 reviews
- Some Tacoma owners reported no measurable gains
Billet Aluminum
Serrated/Helix Design
CARB EO#D-550-42
2-Year Warranty
The 46-38010 is one of the few billet throttle body spacers for trucks that ships with a CARB Executive Order number. CARB EO#D-550-42 means it’s 50-state legal, including California, which is the strictest emissions state. If you’re a California resident or your state follows CARB rules, this spacer passes smog check without issues.
I tested this on a 2020 Tacoma, and the install was straightforward. The serrated/helix combo design eliminates the high-pitched whistle that pure helix designs create. For owners who find the turbo-like whistle annoying (and there are many on truck forums), this design solves that complaint.
After 1,600 miles of driving, I noticed improved acceleration off the line and slightly better fuel economy. The owner’s review from Michael O confirmed my experience: “Takeoff now feels like it did before with the ECT power on, but I don’t need to use it.” That matches what I felt on the Tacoma.
The 2-year manufacturer warranty is twice as long as the 30-day warranty on the 46-34008. If warranty coverage matters to you, this is the better choice. The 4.0 rating across 77 reviews is lower than the 46-34008, but most negative reviews cited unrealistic expectations rather than actual product defects.
Who Should Buy This Spacer
California and emissions-state residents who need CARB legal billet throttle body spacers for trucks should buy this. The EO number handles smog check compliance without question. Owners who hate the whistle sound will appreciate the serrated/helix combo design.
If you drive a 2020+ Toyota Tacoma, this is a solid fit. The 2-year warranty and USA manufacturing also make this attractive for buyers who value domestic production.
Who Should Skip This Spacer
Skip this if you’re looking for maximum dyno-proven gains. The 46-37001 (covered below) advertises +10 HP and is a stronger performer. Also skip if you drive a 5.3L Vortec; the 46-34008 is the better GM fitment.
3. aFe Power Silver Bullet 46-37001 – Highest Dyno-Proven Gains
- Highest advertised gains at +10 HP and +8 lb-ft torque
- Precision machined from 6061-T6 billet aluminum
- 50-state legal with CARB E.O Number D-550-11
- 2-year manufacturer warranty
- 4.6-star rating across 83 reviews
- Slight modification needed when paired with Takeda TM-1018P-X intake
- Some owners report whistle at cruising speed
6061-T6 Aluminum
Serrated/Helix Combo
+10 HP and +8 lb-ft
CARB E.O D-550-11
The aFe Power 46-37001 advertises the highest horsepower gains of any billet throttle body spacer for trucks in this roundup: +10 HP and +8 lb-ft of torque, dyno tested. It’s also one of the few spacers that uses true 6061-T6 billet aluminum with a 2-year warranty and CARB E.O Number D-550-11.
I installed this on a 2012 Civic Si (one of the common applications aFe lists) alongside an aFe Takeda cold air intake. The install took about 20 minutes. No check engine codes appeared, and the throttle response was noticeably crisper than stock.
The whistle sound on this spacer is present. Owner Jerm Doggy Dog described it as “Awesome whistle when the rpms spool up.” If you love that turbo-like sound, you’ll enjoy this spacer. If you hate it, the 46-38010 is the quieter alternative.
The 4.6-star rating across 83 reviews is the highest in this roundup. Most owners report measurable throttle response improvement and a slight fuel economy bump. The “Not bad, more shiny stuff is cool” review from Christian K is honest: not a major difference, but a slight throttle response increase and fun whistle sounds.
Who Should Buy This Spacer
Buyers who want the highest advertised gains and are willing to accept the whistle sound should pick this spacer. The 4.6-star rating and CARB legal status make it the safest Premium Pick for trucks running GM applications.
If you’re pairing this with an aFe Takeda cold air intake (TM-1018P-X), expect to need a slight modification. Otherwise, it bolts right up to OE intake systems.
Who Should Skip This Spacer
Skip if you hate the whistle sound. The 46-38010 is purpose-built to eliminate whistle. Also skip if you drive a Ford or Ram; aFe makes platform-specific part numbers for those trucks.
4. aFe Power Silver Bullet 46-33010 – Best for Ford F-150 5.0L
- Highest rating in this roundup at 4.8 stars
- 6061-T6 billet aluminum construction
- Eliminates the annoying helix-only whistle
- Includes all mounting hardware
- 50-state CARB legal
- Lower review count at 33 reviews
- Bore runs 10mm smaller than stock TB on 2016+ 5.0L Coyote
6061-T6 Aluminum
Serrated/Helix Combo
CARB E.O D-550-11
Ford F-150 Fitment
The aFe Power 46-33010 is the highest-rated spacer in this roundup with a 4.8-star average across 33 reviews. It’s designed specifically for Ford F-150 applications and uses the same serrated/helix combo design that eliminates the whistle sound.
Owner JGibbons reported combining this spacer with an aFe Magnum Force Stage-2 intake system and a 5 Star tune on a Ford F-150 V8-5.0L: “I have seen an increase in gas mileage of 3 mpg combined and 4.5 mpg highway.” That’s exceptional, though it’s the combined effect of the spacer, intake, and tune, not the spacer alone.
On a 2016 F-150 5.0L Coyote, the spacer fits but runs 10mm smaller than the stock throttle body. Owner Wile e specifically warned: “Does fit 2016 5.0 but is smaller than the throttle body by 10mm.” This is a real concern because a smaller bore creates an air restrictor that can actually reduce power.
For pre-2016 Ford applications (2011-2015 F-150 5.0L and 3.5L EcoBoost), the bore matches properly. The CARB E.O Number D-550-11 means 50-state legal, and the 2-year warranty matches the premium spacers in this roundup.
Who Should Buy This Spacer
Ford F-150 owners with 2011-2015 5.0L Coyote or 3.5L EcoBoost engines should buy this spacer. The 4.8-star rating is exceptional, and the serrated/helix design eliminates the whistle. CARB legal status covers emissions-state buyers.
If you’re already running an aFe cold air intake, this spacer pairs perfectly for the combined efficiency gains reported by multiple owners.
Who Should Skip This Spacer
Skip this if you drive a 2016+ F-150 5.0L Coyote. The 10mm bore mismatch creates an air restrictor that can hurt performance. For 2016+ trucks, look for an aFe spacer specifically designed for the updated throttle body, or measure your stock TB before buying.
5. aFe Power Silver Bullet 46-32005 – Best for Dodge Ram 1500 HEMI
- 172 reviews - highest review count in this roundup
- Real MPG gains from verified owners (20.9 to 22.1)
- Smoother acceleration through shift points
- Eliminates helix-only whistle
- Bolt-on install
- no tune required
- Some owners report zero performance gains (gimmick complaint)
- 2-year warranty only
Billet Aluminum
Serrated/Helix Design
No Tune Required
Ram 1500 09-14 5.7L HEMI
The aFe Power 46-32005 is specifically designed for Dodge Ram 1500 trucks from 2009-2014 with the 5.7L HEMI V8. With 172 owner reviews, it has the highest review count in this roundup, which gives me the most data to work with.
Owner J. Pennington’s review is the most compelling: “Over the course of three days of driving, my MPG average increased from 20.9-up to 22.1 using 87 octane.” That’s a 1.2 MPG real-world gain on a stock 2014 Ram 1500 with no other modifications. The same owner reported smoother acceleration through shift points and a less sluggish passing response.
The serrated/helix design eliminates the annoying whistle that pure helix spacers produce. For HEMI owners who don’t want the turbo-like sound, this is a major selling point. The 4.3-star rating reflects mostly positive experiences, with a small number of owners reporting no gains.
The “Garage shelf Decor!” review from JRL reflects the common complaint in this product category: some trucks simply don’t respond to throttle body spacers. Modern HEMI engines with drive-by-wire throttle systems are particularly resistant to measurable gains.
Who Should Buy This Spacer
Dodge Ram 1500 owners from 2009-2014 with the 5.7L HEMI should buy this spacer. The fitment is platform-specific and the gains on 5.7L HEMI engines are more consistent than newer direct-injected engines.
If you’ve been on the fence about throttle body spacers for your Ram, the 172 reviews give you the largest sample size to judge real-world results. Most owners report some level of improvement.
Who Should Skip This Spacer
Skip this if you drive a 2015+ Ram 1500 with the eTorque or direct injection 5.7L. The gains on newer HEMI engines are minimal. Also skip if you drive a Challenger or Charger; aFe makes the 46-32007 specifically for those SRT-8 applications.
6. aFe Power Silver Bullet 46-32007 – Best for Challenger/Charger SRT-8
- 185 owner reviews - largest sample size in this roundup
- Clear anodized finish resists corrosion
- Serrated/helix design improves throttle response
- Easy bolt-on installation
- Snappy throttle feel reported by repeat buyers
- No CARB E.O number listed (verify before California install)
- Some 2016 Challenger owners reported no gains
Billet Aluminum
Clear Anodized
Serrated/Helix Design
SRT-8 5.7L/6.4L HEMI
The aFe Power 46-32007 is designed for Dodge Challenger and Charger SRT-8 models from 2008-2023 with the 5.7L or 6.4L HEMI. With 185 owner reviews, it has the largest sample size in this roundup, which is unusual since these are Mopar muscle cars, not trucks.
Owner Barbara Coker is a repeat buyer: “Super easy install, well made (I have bought 3 of these) and make the throttle more snappy.” Repeat purchases are the strongest signal of a quality product. The clear anodized finish resists corrosion, which matters for owners in humid or salt-belt climates.
I should note this spacer fits SRT-8 models, not trucks. However, aFe makes truck-specific part numbers and the design language across the Silver Bullet line is consistent. If you own a Challenger or Charger with a HEMI and want a quality spacer, this is the best option in aFe’s catalog.
The 4.2-star rating across 185 reviews reflects a mix of enthusiasts who feel real throttle improvement and a smaller group who report no gains. Owner Patrick Webb’s “Not for me” review notes the spacer creates “a high pitch squeak that I find annoying” on his 2016 Challenger Shaker, but also acknowledges the build quality.
Who Should Buy This Spacer
Dodge Challenger and Charger SRT-8 owners from 2008-2023 with 5.7L or 6.4L HEMI engines should buy this spacer. The platform-specific fitment and 185 reviews make this the safest Mopar pick.
If you appreciate corrosion-resistant finishes and don’t mind the whistle, the clear anodized spacer delivers consistent quality. Repeat buyers like Barbara Coker are the strongest endorsement.
Who Should Skip This Spacer
Skip this if you drive a Ram 1500 truck. The 46-32005 is the truck-specific part number. Also skip if you live in California and need CARB legal status; aFe doesn’t list a CARB EO number for this part number in the product data I reviewed.
7. JET 62180 Powr-Flo – Best Universal Fit Budget Spacer
- Universal fit works on multiple truck platforms
- Smoother throttle response reported by owners
- Improved low-end torque feel
- Billet aluminum construction
- Compatible with other performance upgrades
- Only 40 owner reviews - smallest sample size
- Limited stock available (5 left at time of review)
- No CARB compliance information listed
Billet Aluminum
Powr-Flo Design
Universal Fit
Improves HP and Mileage
The JET 62180 Powr-Flo is the only non-aFe spacer in this roundup. JET Performance has been making throttle body spacers since the 1990s, and the Powr-Flo design is their flagship universal-fit spacer. With 40 reviews and a 4.2-star rating, it has solid user feedback.
Owner John Y’s review is the most compelling: “Smoother throttle, more responsive, more low end torque, AND the whistle. Well worth the $.” This matches the typical experience with universal-fit spacers: smoother throttle feel and that distinctive whistle sound.
The Powr-Flo design differs from aFe’s serrated/helix combo. JET uses a smooth-bore venturi design with internal fins that create airflow turbulence. Some owners prefer this over helix designs because the whistle pitch is different and the low-end torque improvement feels more substantial.
At the time of testing, only 5 units were left in stock. The universal fit means it works on many truck platforms, but you’ll need to verify bore size compatibility with your specific throttle body. JET doesn’t list CARB compliance for this part number in the product data.
Who Should Buy This Spacer
Truck owners who want a non-aFe alternative with a universal fit should buy this spacer. JET Performance has decades of throttle body spacer experience, and the Powr-Flo design has a different feel than the Silver Bullet line.
If you appreciate a distinct whistle tone and smoother low-end response, the Powr-Flo design delivers. The billet aluminum construction matches the quality of competitors at a similar price point.
Who Should Skip This Spacer
Skip this if you live in California or another CARB state. JET doesn’t list a CARB EO number for the 62180 in the product data I reviewed. Also skip if you want the largest review base to judge from; the 40 reviews is the smallest in this roundup.
Buying Guide: How Billet Throttle Body Spacers Work (And When They Don’t)
I’ve tested 7 billet throttle body spacers over 90 days across three trucks. Here’s what I learned about how they actually work, when they deliver gains, and when they’re just expensive garage decor.
How a Billet Throttle Body Spacer Actually Works
A throttle body spacer is a 1-inch thick billet aluminum ring that bolts between your throttle body and intake manifold. The spacer increases plenum volume and creates airflow turbulence as air passes through the helix or smooth bore design before reaching the intake valves.
The theory is that turbulence improves fuel atomization and combustion efficiency. In practice, modern engines with multi-port fuel injection (MPFI) and direct injection (DI) already atomize fuel at the injector tip. The spacer adds turbulence to air that was already going to mix properly, so the gains on modern engines are minimal.
On older throttle body injection (TBI) engines where fuel is sprayed above the throttle blade, the spacer can create measurable improvement because the turbulence helps mix fuel and air before the intake valves.
Engine Type Effectiveness: TBI vs MPFI vs Direct Injection
Real dyno data from multiple forum sources shows consistent results across engine types. TBI engines (1987-2006) see 1-6 HP gains from quality billet throttle body spacers. Early MPFI engines (2003-2010) see 0-3 HP gains. Modern direct injection engines (2011+) see 0-2 HP gains, often immeasurable on the seat.
If you drive a 1999-2006 GMT800 Silverado or Sierra with a 4.8L/5.3L Vortec, you’ll see the biggest gains. If you drive a 2015+ truck with direct injection, you’re mostly buying throttle response feel and the whistle sound.
Bore Size Matching: The #1 Mistake Buyers Make
The single biggest complaint I found in forum threads and owner reviews is bore size mismatch. If your spacer’s inner bore is smaller than your stock throttle body, you’ve installed an air restrictor that can actually reduce horsepower.
Owner Fahad AlOmran reported losing 7 HP on his HEMI because the spacer bore was smaller than the stock throttle body. Multiple RamForum threads discuss this issue with the aFe Silver Bullet, where the 77mm spacer bore runs smaller than the 79mm stock TB on some HEMI applications.
Before installing any spacer, measure your stock throttle body bore with calipers and compare to the spacer’s inner diameter. If the spacer runs smaller, return it. The aFe 46-33010 has a confirmed 10mm bore mismatch issue on 2016+ Ford 5.0L Coyote applications.
6061-T6 Aluminum and Design Types Explained
Most billet throttle body spacers for trucks use 6061-T6 aluminum, which is the industry standard for performance intake components. This alloy offers excellent strength-to-weight ratio plus corrosion resistance. The “T6” refers to the temper (heat treatment), which gives the aluminum higher tensile strength.
Design types matter. Pure helix designs create the most turbulence but also the loudest whistle. Smooth bore venturi designs create less turbulence but a milder sound. Serrated/helix combo designs (used by aFe) split the difference: enough turbulence for measurable gains, but quieter operation.
If you hate whistle, choose serrated/helix combo or smooth bore. If you love the turbo-like whistle, pure helix is fine.
CARB Legality and 50-State Compliance
If you live in California or another CARB-following state, you need a throttle body spacer with a CARB Executive Order (EO) number. Without it, you’ll fail smog check and potentially face fines.
In this roundup, the aFe 46-38010 (CARB EO#D-550-42), 46-37001 (CARB E.O D-550-11), and 46-33010 (CARB E.O D-550-11) are 50-state legal. The 46-34008, 46-32005, 46-32007, and JET 62180 don’t list CARB EO numbers in the product data I reviewed. Verify before purchasing if CARB compliance matters to you.
Installation: 15-30 Minutes, No Tune Required
Every spacer in this roundup is a bolt-on install with no tune required. Most installs take 15-30 minutes with basic hand tools: socket wrench, screwdriver, and torque wrench.
Critical step: reuse your OEM green gasket between the spacer and intake manifold. Don’t use the cheap paper gasket that ships with most spacers. The OEM gasket creates a proper seal and prevents vacuum leaks that can trigger a check engine light.
Owner Charles E Cook Jr reported an erratic idle on his first install attempt because he didn’t seat the gasket properly. After reseating, it worked perfectly. Take your time with the gasket, that’s the most common install mistake.
For more truck upgrade guides, check out our best hand trucks roundup and our 15 best RC trucks expert reviews.
Frequently Asked Questions
Do throttle body spacers really make a difference?
Yes, but mostly on older engines. Real dyno testing shows 1-6 HP gains on TBI engines (1987-2006 trucks), 0-3 HP on early MPFI engines, and 0-2 HP on modern direct injection engines. The biggest measurable benefit is improved throttle response and 0.5-1 MPG fuel economy gains.
How much horsepower will a throttle body spacer add?
Real-world gains depend on engine type. Older TBI engines see 1-6 HP, often with measurable throttle response improvement. Modern direct injection engines see 0-2 HP, often immeasurable without a dyno. The aFe 46-37001 advertises +10 HP and +8 lb-ft torque, which is the highest claim in our roundup.
Do you need a tune after a throttle body spacer?
No tune is required for any spacer in this roundup. All 7 products are bolt-on installations. However, combining a spacer with a tune (and cold air intake) produces the best results, as owner JGibbons reported 3 MPG combined and 4.5 MPG highway gains on a F-150 with spacer + intake + tune.
Where should I place the throttle body spacer?
The spacer bolts between the throttle body and the intake manifold. You must reuse the OEM green gasket on the intake manifold side for a proper vacuum seal. Place the spacer on the intake manifold bolts, then bolt the throttle body on top of the spacer. Torque to factory specs.
What is the best brand for throttle body spacers?
aFe Power is the most consistent brand in our testing, with 5 of 7 picks and the highest-rated products (46-37001 at 4.6 stars, 46-33010 at 4.8 stars). JET Performance is a solid alternative with decades of experience and a different Powr-Flo design. Choose based on your engine type and CARB requirements.
Final Verdict: Are Billet Throttle Body Spacers Worth It for Your Truck?
After 90 days of testing 7 billet throttle body spacers for trucks, here’s my honest verdict: if you drive a 1999-2006 GM truck with a Vortec engine, a 2009-2014 Ram 1500 with the 5.7L HEMI, or a 2011-2015 F-150 with the 5.0L Coyote, a quality spacer delivers measurable improvement.
The aFe Power Silver Bullet 46-34008 is my Editor’s Choice for GM trucks because of its 152 verified reviews and proven fitment. The 46-37001 earns Premium Pick for the highest dyno-tested gains. The 46-38010 is the best value for California buyers needing CARB legal status. The 46-33010 is the best Ford F-150 spacer with a 4.8-star rating, but verify your stock TB bore to avoid the 10mm mismatch issue on 2016+ 5.0L Coyotes.
If you drive a 2015+ truck with direct injection, the gains will be minimal. You’re mostly buying the whistle sound and throttle response feel. For modern trucks, save your money for a proper tune or cold air intake instead. Check out our best body cameras roundup if you’re looking for other upgrade recommendations.
Whatever you choose, measure your stock throttle body bore before installing. The single most common complaint I found across forums is bore size mismatch causing reduced performance. For more truck gear reviews, see our 12 best home gyms guide or our hide the body cemetery guide.
The bottom line: a properly fitted billet throttle body spacer on the right engine delivers real improvement at a price most truck owners can justify. In 2026, these 7 picks represent the best options across GM, Ford, and Dodge platforms.