Product details

Designed specifically for GM 4.8/5.3/6.0L cathedral port truck engines and cathedral port LS1, -2, -6 race applications where hood clearance is not a concern, the FAST LSXRT102mm Intake Manifold follows the path chartered by the original FAST LSX Gen III Intake by featuring a modular design that allows for easy porting and disassembly and a runner design that yields an incredible 25 peak horsepower gain over the stock intake, on a stock 6.0L engine with a Big Mouth 102mm Throttle Body similar to the LSXR 102mm Intake Manifold for cars, the LSXRT features the ability to remove individual runners for modification. The LSXRT is constructed from a proprietary precision injection molded polymer which offers many benefits, including lighter weight, greater strength and lower heat soak propensity. While it features a 102mm air inlet that was designed for the FAST Big Mouth 102mm Throttle Body, it can also be used with stock 90mm or aftermarket 92mm throttle bodies (78mm three-bolt throttle bodies require an adapter). Other features include integrated nitrous bungs and precise bolt-on fit that permits the use of factory accessories and OEM fuel/emission connections without adjustments or clearance issues. Some GM truck models may require the FAST 92mm or 102mm throttle body. The LSXrt Intake + Big Mouth 102mm Throttle Body Kit increases horsepower and throttle response thanks to improved manifold flow and a 102mm throttle body bore. Billet throttle blade decreases deflection, polymer manifold reduces heatsoak. LSXrt 102mm LS Truck Intake Manifold + 102mm Big Mouth Billet Throttle Body Kit

Manufacturer fitment & guides

Check 146602B-KIT against the manufacturer’s application information below.

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Part-specific notes

• Not CARB approved. Destination and intended-use restrictions must be checked before sale.
• Emissions acknowledgement required before purchase.
• California Proposition 65: Y

Manufacturer documents

• User 1