I purchased an Aeroturbine muffler for my 05. I plan on mounting the Aeroturbine as close to the converter as possible, removing the stock muffler and having a new piece of pipe bent to connect the Aeroturbine and the stock tailpipe. I want to keep the stock muffler and pipes so that whenever I sell this truck I can return the system to stock. I called around to several muffler shops trying to find someone who could bend 4" pipe and preferably 409 stainless steel like the stock system. I found one shop that can bend 4" but they can not bend (and garrentee a clean bend) stainless steel, just aluminized. My question is, will there be any kind of bi-metal reaction joining aluminized pipe to the SS? Also, how long could I expect the aluminized to last? My '99 that I traded had 115,000 miles on it and the system looked like new. Was it aluminized or stainless?