LSXRT™ 102mm Truck Intake Manifold (Cathedral Port Heads)LSXRT Injection Molded Polymer Intake Cathedral Port Head Equipped Applications Designed specifically for GM 4. 8 5. 3 6. 0L cathedral port cylinder head equipped truck engines and cathedral port LS1, 2, 6 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