Stainless Works 90-92 Chevrolet Corvette ZR1 Long Tube Header Kit w/ High Flow Cats1990 92 Chevy ZR1 Corvette full length high flow catted headers. 2" tuned length primary tubes, 3 8" CNC laser cut flanges. All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. Port Matched to factory cylinder heads with oval ports. These headers make awesome power and are dyno proven to make over 30 RWHP more than factory manifolds. Excellent fitting headers. Includes 3" ball socket and 3"