today we used 3/4 inch conduit to make the angles we need in the bends for the rest of the exhaust system....next problem is finding someone with a Mandral to bend stainless my local shop recommended a shop in Linden NJ hope he will do it for me his receptionist said to email him I will with the pictures. I went to his web site looks like he does some highend work and has participated in SEMA in the past ill see if i can get his attention