FAST LSXRT Manifold 102MM LS Truck Intake Manifold KitDesigned 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