The FAST LSXHR 103mm Intake Manifold is ideal for generating maximum power in boosted and naturally aspirated GM LS cathedral port engines. It ships with a set of tall removeable velocity stacks, however medium and short stack options can be purchased separately. This allows interchanging of the various runner lengths so racers can experiment with finding which combination makes the most power in their application. Its polymer construction is lightweight, very strong and virtually eliminates power-robbing heat soak that occurs with commonly available aluminum intake manifolds. The manifold has been optimized to make power from 5,000 to 7,500 RPM, with testing showing 20+ horsepower gains over competitor tunnel ram intake manifolds. The FAST LSXHR 103mm Intake Manifold is designed specifically with boosted applications in mind and is rated for up to 45psi of continuous boost pressure. The compound fuel injector angle aims the spray pattern for ideal atomization, resulting in maximum power production and superior drivability. Also included with the intake manifold are custom fuel rails and necessary hardware. A reversible top allows for forward- or firewall-facing throttle body installations. The intake manifold also features two nitrous nozzle bosses per runner for clean and easy direct port system installations. Additionally, its 103mm throttle body opening can be port matched up to 105mm.

All the benefits of the current Big Mouth 102mm Throttle Body(TM) are now available for drive-by-wire applications, thanks to the new FAST(TM) 102mm Electronic Throttle Body for GM LS Engines. This new electronic throttle body provides a huge increase in airflow over stock – especially when running a FAST manifold. However, it maintains stock characteristics at idle. The electronic throttle body is designed to be plug-and-play for most stock Gen IV LS ECUs including but not limited to L76, L77, L99, LS3, or LS7. It works well with the Edelbrock ProFlo4+ or any aftermarket EFI system designed to control a GM LS-style electronic throttle body. A high-performance, high-torque motor delivers a quicker response over competitors' weaker stock motors and features a rock-steady throttle blade in for boosted applications. Additionally, utilizing a dual return spring and a precision non-contact TPS increases reliability, the throttle body also features a stylish satin black anodized finish for excellent aesthetics and a unique look. The FAST(TM) 102mm Electronic Throttle Body for GM LS Engines does not use any stock components and has been designed for increased performance and reliability.

• Clean-sheet design by EPG engineers means no components from a stock throttle body are used
• full 102mm bore provides more airflow w/less restriction than stock
• Satin Black anodize finish for excellent aesthetics.
• Works w/ OEM GEN VI GM ECUs, Edelbrock ProFlo4+
• Designed for drive-by-wire applications

The Fast Big Mouth 102mm throttle body provides increased airflow through a smoother offset blade pivot. In addition we increased blade thickness to eliminate deflection and a beefed up linkage and spring mechanism.

Replacement parts available. See 54039BUS for the upper shell. See 54039BLS for lower shell. Billet fuel rails available under 54023. Compatible throttle bodies available under 54092 and 54090.

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These gaskets are designed to provide a seal between the LSX 92mm intake manifold and LS1, LS2 and LS6 cylinder heads.

• These gaskets are designed to provide a seal between the LSX 92mm intake manifold and LS1, LS2 and LS6 cylinder heads

Air Temperature Sensor used in EZ Fuel and EZ Fuel + Ignition Throttle Bodies

FAST XFI Fuel Injector Harnesses connect the XFI ECU to the fuel injectors. These harnesses are designed to aC-Commodate most common V8 engines from the Chevrolet Small Block to GM LS Series, Ford Small and Big Blocks as well as Windsor, Modular, FE configurations. FAST also has taken the intiative to help out customers with less common applications such as Buick V6, Modern Chrysler and even 4 cylinder applications. And, while we may not have a custom tailored injector harness that fits your needs, all of our harnesses can be re-pinned for custom firing orders and reterminated to aC-Commodate different injector connectors.

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FAST offers several main harness options to aC-Commodate most customers' needs. The XFI Main Harness is responsible for connecting your XFI ECU to sensors as well as digital dashes, EGT modules, and various optional accessories. The Main Harness also handles communication between the ECU and ignition devices. Main harnesses are available in TPI, LT-1, LS-1 through 9 (including truck/suv designs), Modern Hemi, Carburetor Conversions and even Rear-Engine Dragsters and Boats. FAST also offers Main Harnesses that come terminated on the sensor side but non-terminated on the ECU side to allow for a truely custom fit. All terminals, seals and connectors are available individually, so don't hesitate to try your hand at crafting your own custom harness from start to finish.

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Made of stainless steel and convenient for quick oxygen sensor tests, this easy-to-use FAST kit slides into the tail pipe to prevent welding. The actual O2 sensor screws into the kit, which includes a rubber cover to prevent damage to polished exhaust tips.

The FAST LSX 102mm Intake Manifold for GM 4.8, 5.3 and 6.0 truck engines provides bolt-on performance gains without any loss in bottom-end drivability.This manifold features our standard design runners for use in mild street applications.

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Constructed from the same advanced polymer material as the original FAST LSX 92mm Intake Manifold, but now in the popular black color, the LSXR offers a host of benefits over aluminum aftermarket intakes, including lighter weight, increased strength and improved heat dissipating characteristics.

This Part Fits:

These gaskets are designed to provide a seal between the LSXR 102mm intake manifold and LS1, LS6 and LS7 cylinder heads.

• These gaskets are designed to provide a seal between the LSXR 102mm intake manifold and LS1, LS6 and LS7 cylinder heads

Constructed from the same advanced polymer material as the original FAST LSX 92mm Intake Manifold, but now in the popular black color, the LSXR offers a host of benefits over aluminum aftermarket intakes, including lighter weight, increased strength and improved heat dissipating characteristics.

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FAST has developed the industry’s first polymer tunnel ram-style intake manifold, ideal for generating maximum power in boosted and naturally aspirated engines. Available for rectangular port LS3 and raised rectangular port LS7 engines, the FAST LSXHR FAST-RAM Intake Manifold features removable stacks of various lengths, so racers can experiment with finding which combination makes the most power in their application. Its polymer construction is not only lightweight and high strength, but also virtually eliminates power-robbing heat soak that occurs with commonly available aluminum intake manifolds. Testing has shown an average 30-horsepower gain between 5,000 and 7,500 RPM over competitor tunnel ram intake manifolds. The FAST LSXHR FAST-RAM Intake Manifold is designed specifically with boosted applications in mind and is rated for up to 45psi of continuous pressure. Compound fuel injector angle aims the spray pattern for ideal atomization, resulting in maximum power production and superior drivability. A reversible top allows for forward- or firewall-facing throttle body installations. The intake manifold also features two nitrous nozzle bosses per runner for clean and easy direct port system installations. Its 103mm throttle body opening can be port matched to 105mm.

This Part Fits:

Constructed from the same advanced polymer material as the original FAST LSX 92mm Intake Manifold, but now in the popular black color, the LSXR offers a host of benefits over aluminum aftermarket intakes, including lighter weight, increased strength and improved heat dissipating characteristics.

This Part Fits:

FAST LSX/LSXR/LSXRT Fuel Rails feature a larger internal diameter that dampens the pulses and provides increased fuel volume, ensuring that your injectors never run dry. In addition, they yield better fuel distribution and ultimately greater horsepower. Featuring high strength billet, lightweight, red or black (specific applications) anodized aluminum construction (does not include Part 146020-KIT or Part 146021-KIT), FAST fuel rails deliver performance in addition to a show car quality appearance.

FAST LSX/LSXR/LSXRT Fuel Rails feature a larger internal diameter that dampens the pulses and provides increased fuel volume, ensuring that your injectors never run dry. In addition, they yield better fuel distribution and ultimately greater horsepower. Featuring high strength billet, lightweight, red or black (specific applications) anodized aluminum construction (does not include Part 146020-KIT or Part 146021-KIT), FAST fuel rails deliver performance in addition to a show car quality appearance.

This fuel injector spacer kit for LS3/L99 and L76 engines is designed to allow the use of OE fuel rails with our 146102B, 146103B and 146104B 102mm intake manifolds.

This seal kit for LSXR and LSXRT manifolds includes 8 intake runner to cylinder head seals as well as new injector o-rings, lower shell rubber bumpers and vacuum port plugs.

• This seal kit for LSXR and LSXRT manifolds includes 8 intake runner to cylinder head seals as well as new injector o-rings, lower shell rubber bumpers and vacuum port plugs

This intake manifold gasket ensures a proper seal between the upper and lower shells on our 102mm LSXR and LSXRT intake manifolds.

• This intake manifold gasket ensures a proper seal between the upper and lower shells on our 102mm LSXR and LSXRT intake manifolds

This gasket provides a seal between the throttle body and our LSXR/LSXRT 102mm Intake Manifolds.

• This gasket provides a seal between the throttle body and our LSXR/LSXRT 102mm Intake Manifolds