Throttle Body FAQ

Granatelli Motor Sports, a performance parts company in Oxnard, California that has built performance parts since 1949. We sell drive-by-wire throttle bodies for GM LS and LT, HEMI, Hellcat / Trackhawk and Ford Coyote engines and support them by phone at 1-805-486-6644.

Current sizes are 90mm (Ford Coyote Mustang GT), 95mm (HEMI and GM Gen V LT), 103mm (GM LS and LT), 105mm (GM LS and Hellcat / Trackhawk), 108mm (GM LS and Hellcat / Trackhawk), 112mm (GM LS and LT) and 120mm (GM LS). See them all in our throttle body collection.

Yes. Every current Granatelli throttle body is an electronic drive-by-wire unit. None of them are cable-operated, so they are not for engines with a throttle cable.

Most Granatelli throttle bodies are CNC-machined from billet aluminum, 6061-T6 on most models, and come in natural, black or polished finishes. Two are cast aluminum with precision-machined surfaces: the GM LS 103mm GMTBLS3M and the HEMI 95mm black GMTBHLCM. The cast units cost less: $445.13 against $680.79 for the billet LS 103mm and HEMI 95mm units. The cast LS 103mm is rated for up to 35 psi of boost on its product page.

Natural aluminum, black and polished. Black is available in every engine family. Polished is offered on the LS 103mm GMTBLS3P.

Each one is a complete electronic assembly, so you do not move the motor, sensor or any internal parts from your factory throttle body. The GM LS units and the LT 103mm and 112mm units use the factory-style GM 6-pin connector, and the 2018–2023 Mustang GT unit installs with the factory connectors. Exceptions: 2005–2010 HEMI vehicles need a Granatelli adapter harness, some Hellcat / Trackhawk intakes need an adapter sleeve (not included), and GM and Ford throttle bodies require a tune (Dodge/Mopar HEMI throttle bodies need no tune).

Several models use motors built for boost. The LS 103mm polished GMTBLS3P has a high-torque servo motor, the LS 112mm GMTBLS112B has a reinforced motor and throttle-blade assembly, the LT 112mm units use a high-torque motor, and the Hellcat / Trackhawk units use a boost-resistant motor. Refer to the individual product listing for exact specifications.

It depends on the model. Every Granatelli GM LS and Gen V LT throttle body, billet or cast, is rated for up to 35 psi. On the HEMI side, the Hellcat / Trackhawk 108mm units are rated for 25+ psi and the Hellcat / Trackhawk 105mm for up to 25 psi. Several are listed for both draw-through and blow-through setups.

These product pages state Made in the USA: GMTBLS3B, GMTBLS3P, GMTBLS3M, GMTBLS108, GMTBLS112B, GMTBLT112, GMTBHLC, GMTBHLCB and GMTBHLCM. For any other part number, call 1-805-486-6644 to confirm country of origin.

No. A larger throttle body only helps when it addresses an airflow restriction in the overall engine combination. Intake, cylinder-head, induction and tuning requirements matter, so we do not quote a fixed horsepower number.

Not necessarily. Choose a size that fits the intake and supports your engine's airflow requirements without creating clearance or calibration issues. Our drive-by-wire throttle body page lets you search by year, make and model.

No. Bore size is only one fitment factor; mounting, electronics, manifold opening and vehicle calibration must also match.

Granatelli throttle bodies carry a 90-day warranty. You can add 1-, 2- or 3-year extended coverage at checkout. For a claim, contact us with proof of purchase and the part number.

Orders placed before 3:30 PM Pacific ship the same business day, and website orders over $100 ship free.

103mm in billet (GMTBLS3, black GMTBLS3B, polished GMTBLS3P) or cast (GMTBLS3M), 105mm (GMTBLS105, GMTBLS105B), 108mm (GMTBLS108, GMTBLS108B), 112mm (GMTBLS112B) and 120mm (GMTBLS120). Availability and fitment depend on the specific manifold and part number.

The billet 103mm units (GMTBLS3, GMTBLS3B, GMTBLS3P) list LS1, LS2, LS3, LS6, LS7, LS9, LSA, LSX, LQ4 and LQ9 when the correct 6-pin drive-by-wire setup is used. The cast GMTBLS3M lists LS3, LSA, LSX and boosted 6.2L LS combinations. Engine family alone does not guarantee fitment, so verify the connector, manifold bolt pattern, throttle opening and clearance.

The best one matches your intake opening and bolt pattern, uses your 6-pin drive-by-wire connector, is rated for your boost level and suits your budget. For a stock-style or boosted LS3 intake, the 103mm units list LS3: cast GMTBLS3M ($445.13, adapter included, rated to 35 psi) or billet GMTBLS3 / GMTBLS3B / GMTBLS3P ($680.79, rated to 35 psi). The 108mm GMTBLS108 ($811.72, adapter included) and 112mm GMTBLS112B ($937.40) also list LS3 for engines that need more airflow. For a 105mm or 120mm intake, match the throttle body to the manifold inlet. A tune is required.

Match the throttle body to the manifold inlet. The ZILLA 105mm manifold pairs with the 105mm GMTBLS105 or GMTBLS105B, and the ZILLA 120mm manifold pairs with the 120mm GMTBLS120. See the LS and LT Intake Manifold FAQ for manifold questions.

Call 1-805-486-6644 before ordering. Trailblazer SS applications need specific calibration, and the GMTBLS3, GMTBLS3B, GMTBLS3M, GMTBLS108, GMTBLS108B, GMTBLS112B and GMTBLS120 product pages all ask Trailblazer SS owners to contact us first. The polished GMTBLS3P is listed as not compatible with Trailblazer SS applications.

95mm (GMTBLT95B), 103mm (GMTBLT4, GMTBLT4B) and 112mm (GMTBLT112, GMTBLT112B). The 103mm and 112mm units are listed for GM Gen V LT1, LT4 and LT5 engines and use the factory-style GM 6-pin connector. Verify the exact vehicle, connector and intake-manifold opening before ordering.

Yes, with the GMTBLTSPC billet adapter spacer plate. It mounts the GMTBLT4 or GMTBLT4B 103mm throttle body to a stock GM LT1 or LT4 intake manifold. The gasket and mounting hardware are not included, and a tune is required.

The GMTBLT95B is a 95mm black billet drive-by-wire unit listed for the LT1 and, in its specifications, for select GM Gen V 5.3L and 6.2L V8 applications. Fit varies by model year, intake manifold, bolt pattern, connector and calibration, so call 1-805-486-6644 with your vehicle details before ordering.

Yes. The 95mm HEMI line comes in billet (GMTBHLC), black billet (GMTBHLCB) and black cast (GMTBHLCM) for electronic drive-by-wire Dodge, Chrysler, Jeep and Ram HEMI engines. These 95mm HLC units are for the 5.7L, 6.1L and 6.4L HEMI and do not fit the Hellcat, Hellcat Redeye or Demon. Confirm the engine and model-year fitment on the product listing.

GMTBHLC and GMTBHLCM list the 5.7L, 6.1L and 6.4L / 392 HEMI. GMTBHLCB lists the 5.7L and 6.4L / 392. Vehicles listed include the Challenger, Charger, Chrysler 300, Durango, Jeep Grand Cherokee and Ram trucks without E-Torque, plus the Magnum (GMTBHLC) and 6.4L Wrangler where clearance allows (GMTBHLCB). They are not for non-HEMI engines or cable throttles. None of the 95mm HLC units (GMTBHLC, GMTBHLCB or GMTBHLCM) fit the 6.2L supercharged Hellcat, Hellcat Redeye or Demon. Hellcat and Redeye owners need the SRT-series Hellcat / Trackhawk throttle bodies.

No. The 95mm HEMI throttle bodies will not fit vehicles with the factory E-Torque system because there is not enough physical clearance. If your vehicle has E-Torque, do not order them.

Yes. 2005–2010 HEMI applications need the Granatelli adapter harness. The GMTBHLCB product page states no adapter or harness is required on compatible 2013 and newer applications. For other years, check your throttle-body connector and call before ordering.

Yes. Granatelli makes 105mm (GMTBSRTH, black GMTBSRTHB) and 108mm (GMTBSRT108, GMTBSRT108B) billet drive-by-wire throttle bodies for the supercharged 6.2L Hellcat V8. The 95mm HEMI units do not fit the Hellcat. Confirm the intake opening for your build; no tune is required.

The 105mm and 108mm units list the same vehicles: 2015–2023 Dodge Challenger and Charger (including Redeye), 2021–2024 Dodge Durango, 2018–2021 Jeep Grand Cherokee Trackhawk and 2021–2024 Ram 1500 TRX, all with the 6.2L supercharged Hellcat V8. Some intake setups need an adapter sleeve, which is not included.

Yes. The Hellcat and Hellcat Redeye use the same throttle body, and the Granatelli 105mm and 108mm units list the 2015–2023 Challenger and Charger including Redeye models.

Both are CNC-machined 6061-T6 billet, fit the same vehicles and are built for boost. The 108mm is the larger option at $847.88; if 108mm is too big for your setup, the 105mm is $811.72. Base the choice on your intake opening and supporting modifications, and call 1-805-486-6644 if you are unsure.

Yes, a 90mm black billet drive-by-wire throttle body in two versions: GMTBCYT57B for the 2015–2017 Mustang GT 5.0L ($475.00) and GMTBCYT83B for the 2018–2023 Mustang GT 5.0L ($522.00). Both fit the Mustang GT 5.0L only, not the EcoBoost Mustang. Order by model year, and verify the intake opening, bolt pattern, connector and clearance before ordering.

Often, with the right part. The GM LS 103mm, 108mm and 112mm units are listed for compatible factory or aftermarket manifolds, the 95mm HEMI units are direct replacements for compatible factory drive-by-wire throttle bodies, the Hellcat / Trackhawk units work with stock or aftermarket intakes, and the 2018–2023 Mustang GT unit works with OEM and aftermarket manifolds. An LT1 or LT4 stock intake needs the GMTBLTSPC adapter plate for a 103mm throttle body. The 105mm and 120mm LS units are made for 105mm and 120mm inlet manifolds. Always verify the opening, bolt pattern, connector and clearance.

Sometimes. The cast LS 103mm GMTBLS3M and the LS 108mm GMTBLS108 include an adapter for compatible installations. Some intake manifolds need an adapter for the LS 112mm GMTBLS112B. Some Hellcat / Trackhawk setups need an adapter sleeve, not included. 2005–2010 HEMI vehicles need the Granatelli adapter harness, and stock LT1 / LT4 intakes need the GMTBLTSPC plate for a 103mm unit.

Yes. The electrical connector and control strategy must be compatible with the vehicle; matching only the bore diameter is not enough. Granatelli GM LS units and LT 103mm and 112mm units use the factory-style GM 6-pin drive-by-wire connector.

A 6-pin throttle body uses a six-terminal electronic throttle connection. Granatelli GM LS units and LT 103mm and 112mm units use the factory-style GM 6-pin connector. Connector configuration is important when determining compatibility with the vehicle's wiring and ECU.

No. Connector keying and internal pin functions must match. Never force a connector or assume identical pin count means electrical interchangeability.

Mechanical connector fit does not prove correct pinout, sensor signals or ECU compatibility. Use an adapter specifically validated for both the vehicle and throttle-body part numbers.

Do not assume so. Electronic control strategy and sensor compatibility can differ even when the flange fits; confirm the exact application before installation.

No. Check flange pattern, opening diameter, blade clearance, electronics and inlet-pipe connection for the specific manifold. For manifold questions, see the LS and LT Intake Manifold FAQ.

No. Flange pattern, bolt size, electrical controls, blade clearance and hood or intake-tube space must also match.

Inlet size describes the airflow opening, while the mounting pattern describes the flange and bolt geometry. Both must match the manifold and connecting intake parts.

Only where the product instructions and manifold design call for it. Do not remove material without checking wall thickness, sealing surface and throttle-blade clearance.

Not always. Measure the throttle-body inlet outside diameter and compare it with the coupler and intake-tube dimensions on your vehicle. If they differ, the intake duct, coupler or clamp may need a correctly sized replacement. Granatelli Motor Sports billet hose clamps are sized by the outside diameter of the installed coupler.

Compatibility depends on the spacer, throttle-body flange, blade clearance and available fastener length. Verify the combination before installation. For stock LT1 and LT4 intakes, the GMTBLTSPC adapter spacer plate is made for the Granatelli 103mm throttle body. For the LS 112mm throttle body, Granatelli sells the GMTBLS112SPC 112mm LS throttle body spacer.

Yes. The GMTBLS112SPC is a CNC-machined billet aluminum spacer for the Granatelli 112mm LS drive-by-wire throttle body (GMTBLS112B). It is $235.66 as of October 2026. It is a spacer, not a throttle body. Verify flange, blade clearance and fastener length for your manifold before installing, and call 1-805-486-6644 with fitment questions.

You do not need to. Granatelli throttle bodies are complete electronic assemblies, so nothing moves over from your factory unit. Electronic components and calibrations are not universally interchangeable, so do not swap parts between throttle bodies.

Provide the year, make, model, engine, intake manifold, current throttle-body part number, connector photo and any modifications or tune information.

Capture the connector face, wire routing, original part number, mounting flange and intake-tube connection. These details help confirm replacement fitment.

Checking for free travel, shipping damage and interference can reveal a mechanical issue before the engine is started. Do not force an electronically driven blade against its stops.

Do not add lubricant unless the product's instructions specify it. Residue can attract deposits or interfere with the intended blade and sensor operation.

No. Support rigid or heavy intake tubing independently to avoid stressing the throttle-body housing, couplers and manifold flange.

It depends on the make. GM (Chevy LS and LT) and Ford Coyote throttle bodies require a tune after installation, so use a qualified tuner. Dodge/Mopar HEMI throttle bodies, including the Hellcat and Trackhawk units, bolt on with no tune required. Trailblazer SS owners should call before ordering.

The engine controller may need to adapt to blade-position and airflow characteristics after certain replacements. Use the appropriate vehicle-specific relearn procedure.

Changes in airflow, gasket sealing or learned throttle position can affect idle. Check for leaks, the correct part number and any vehicle-specific calibration or relearn requirements.

An incompatible unit, connection issue, mechanical binding or incorrect calibration can trigger reduced-power mode. Record the trouble codes and verify part number and installation before further driving.

P1515 may relate to electronic throttle control, but the definition varies by vehicle. Use the model-specific diagnostic procedure and check connector, blade movement and calibration.

No. Stop in a safe location and arrange diagnosis of the throttle-control fault before further operation. Record the codes and installed part numbers.

Stop operating the engine and inspect flange alignment, gasket placement, manifold opening and fastener installation. Resolve contact before starting the vehicle again.

A damaged or misaligned seal can admit unmetered air. Check mounting alignment, gasket condition and fastener tightening according to the application instructions.

Yes. An intake or boost leak can produce driveability symptoms that are not caused by the throttle body. Check the full air path and diagnostic codes. See the Billet Hose Clamp FAQ for coupler and clamp checks.

Follow the vehicle and product service instructions and use a compatible cleaning method. Avoid forcing an electronic blade or wetting its motor and sensors.