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FAST LSXRT 102mm Intake Manifold


Product Description

LSXRT Intake Manifold

  • LS1/LS2/LS6
  • 102mm Throttle Body Inlet

Designed specifically for GM 4.8/5.3/6.0L cathedral port truck engines and cathedral port LS1, LS2, LS6 race applications where hood clearance is not a concern, the FAST LSXRT 102mm Intake Manifold follows the path of the original FAST LSX Gen III Intake by using 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 Big Mouth 102mm Throttle Body). Similar to the LSXR 102mm Intake Manifold for cars, the LSXRT's individual runners can be removed for modification.

The FAST LSXRT is constructed from a proprietary precision injection-molded polymer that offers many benefits, including lighter weight, greater strength, and lower heat soak propensity. While it has a 102mm air inlet that was designed for FAST's Big Mouth 102mm Throttle Body, it can also be used with stock 90mm or aftermarket 92mm throttle bodies (78mm 3-bolt throttle bodies require an adapter). Integrated nitrous bungs and precise bolt-on fit permit the use of factory accessories and OE fuel/emissions connections without adjustments or clearance issues. Some GM truck models may require FAST's 92mm or 102mm Throttle Body.


  • For 1997-Later GM 4.8/5.3/6.0L cathedral port truck engines and LS1/LS2/LS6 engines (race applications with appropriate cowl clearance)
  • Multilayer modular design with removable runners for easy disassembly and porting
  • 102mm inlet works with 90, 92 or 102mm throttle bodies for high flow and minimal restriction
  • Advanced polymer material is strong, lightweight, and cools intake charge for enhanced power
  • Big gains in rear wheel HP yet retains factory fitments and underhood clearance requirements
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