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We recommend to use slimline ORB port fittings AF909-06-08 for -6AN line or AF909-08 for -8AN line when installing these rails
Select between open trumpets or carbon fibre plenum
-New idle adjuster screw
Being an LS3 head they have the desired light weight sodium filled inlet valves
FAST 102mm Intake Manifold LS1/LS2/LS6 (Cathedral Port) keihin We recommend to use slimlineFAST engineers teamed up with airflow specialists at RHS to develop polymer intake manifolds for GM LS based engines. Testing on a near stock LS7 engine with a Big Mouth 102mm Throttle Body produced gains of 16+ horsepower, and 26+ rear wheel horsepower on a 500c. i. engine. The LSXR 102mm Intake Manifold features a revolutionary new modular design that allows fast and easy disassembly and features the ability to remove individual runners for porting.