These Texas Speed 3" off-road x-pipe is stainless steel and is designed to be a slip-fit connection to our TSP 1 7/8" long tube headers for the C6 Corvette. It is a full 3" diameter and features mandrel bends for maximum flow and performance. This is NOT a bolt-on item if you do not have the TSP 1 7/8" long tube headers. Custom tuning will be required to turn off your rear O2 sensors to avoid any "service engine soon" lights.