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, 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). Extensive testing led to a runner design that is longer and less restrictive and gives the user the ability to remove individual runners from the manifold for modification. 

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.

Features:

• For 1997-Later GM 4.8/5.3/6.0L cathedral port truck engines and LS1/LS2/LS6 engines - race applications
• 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