I am going to build my own exhaust system for my toyota with chevy 4.3 . The reason is the Y pipe is going to be really nuts and I don't have money to blow on an exhaust shop right now. I plan to use Mandrel bends I buy and cut and weld them to fit what I need. Then its going into a flowmaster 2-1 into a short length of 3" pipe into a hooker aero chamber muffler. The part I can't find is the collector flanges to bolt up to the headers. Any one have any tips??????