JEGS Y-Pipes provide maximum exhaust flow, and they fit directly between the manifolds and cat-back exhaust of Camaros and Firebirds. Made of aluminized mandrel-bent tubing, the pipes include flanges, gaskets, exhaust clamps & oxygen sensor fitting(s). A JEGS cat-back exhaust system is recommended to reap the rewards of the increased exhaust flow. Sold separately, catalytic converter(s) can be added for street-legal use with some modifications required. .