Intake Chevrolet LS1, LS2, LS6 EFI Aluminum intake fits Chevrolet, Pontiac and GMC LS1, LS2, LS6 EFI An intake for EFI (Electronic fuel injection) engines that is made of 3.5mm aluminum and is suitable for 2500-7500 rpm. Equipped with vacuum ports at the bottom and socket for map sensor at the back. Fits - Chevrolet, Pontiac and GMC LS1, LS2, LS6 (Cathedral Gate) Damper Size - 102mm Damper angle - 7° Height - 17.2cm (6.3/4') Material - Aluminum Rpm - 2500-7500 Includes O-ring seals. Nipples for the vacuum ports. NOTE! Cannot use original fuel rails.