The "Y" pipes are made of 1-1/2", 16-gauge, stainless steel tubing connected to the collectors by stock-type 2 bolt cone flange and to the 2" exhaust system with a stock-type 2 bolt flange and cone seal. This manifold comes as raw, stainless steel. They may be painted with high-temperature paint by installer. This replacement 1-1/2" tube "Y" pipe will work with your stock manifold as well as our WCF replacement manifolds. The 2" collector will connect to your stock Fiero down pipe.