wraps
Some years ago, I wrapped my Vetterman crossover exhaust system, for what seemed like obvious reasons.....without any reasearch. Soon after, the crossover slip joints elongated and were leaking bad enough to need repair. I contacted Larry and sent the system back to him, which is no easy task in inself. Larry reworked the joints and also the head flanges and sent it back to me. Larry asked if I had wrapped the system? I confessed I had and asked how he could tell? Larry didn't exactly say the wrap had caused the egg shapeness of the slip joints, but maybe he could see some trace cross pattern the woven wrap may have been left on the Stainless Steel when it arrived to him. He cautioned me about wrapping the exhaust and said above a certain temperature that escapes me now, the metal starts to do funny things and moves around. Now that I have been enlightened, I don't wrap my exhaust and all seems normal. I like normal.
Just my experiance. YMMV.