Borla, DynoMax, Patriot and Pypes all sell the parts you need. I spent $1,600 on my exhausts system that comprised of a custom welded stainless steel header and all stainless steel pipe and mufflers and Bow Tie exhaust tips. Took seven hours from start to finish and lasted the life of the car. It was welded up at the Mad Hatter Muffler shop on Slight Ave in Tampa FL. I shopped around by looking at the Harleys parked out front. They all had custom pipes made by the welder that I hired to make my headers.