Intake Manifold for Chevrolet Corvette (1997-2007) Cathedral Port Black w/Fuel Rail EFIHigh Flow Cathedral Port Intake Manifold for 1997 2007 Chevrolet Corvette (LS1 LS2 LS6 C5 C6) Designed for high rpm performance builds: This single plane EFI intake manifold replaces the restrictive factory composite unit to maximize airflow and fuel delivery for Cathedral Port LS engines operating in the 2500 7000 RPM range. The Stock Corvette Airflow Limitation The factory composite intake manifolds found on C5 and early C6 Corvettes are optimized