1. There are inline resonators available for the x-pipe, quiets most of the systems down significantly. 2. The fumes are the ceramic based coating on the outside curing and burning off some, should go away in short order. Brent is a good guy and wants to make the Z customer happy, so if the sound ends up being something you are unhappy with, call him and let him know, I'm sure he'll work something out with you. His phone # 818 704-7950. Tell him the old f@#k with the slow silver TT and the old 280 ZX suggested you call. Take care, Mark