At what point might I need to consider an aftermarket exhaust system? Say I want to 3x3 my airbox and re-jet my stock Mikuni (or maybe even go FCR), then go with a hotcams intake, then eventually big bore 435. At what point would it really be in my best interest to upgrade to a more free flowing exhaust system, and are there any "hi-flow" exhausts out there that are as quiet as the stocker? I really like the stealthy quietness of the stock system, and I don't have issue with the weight of the stock system....heck I'm pushing 235 myself. If I wanna lose weight from the bike I'd better look at losing weight from myself first. Cheaper for sure.