Hi Kev. Firstly the gasket issue: I rang Delkevic on the day I was installing to discuss with them, and after clarifying what was packaged with my order, the advice given was that I should only need what was supplied. It did come with what I think was a gasket, and high temp silicone sealant, which I used, but I wasn't quite sure whether I could tighten the ring clamp enough to seal it without breaking it. As it stands, I tightened as much as I dare, but I have bought some sort of gasket/sealing paste (meant for exhausts), and I intent to use that just to be sure. And now the sound: you will not be disappointed. It sounds fantastic compared to stock. As I mentioned in a previous post....I am surprised at just how good it sounds...and looks...and feels. I've only heard the bike in the flesh with stock on previously, so I can't compare other after market cans...I'm sure all the big names are great, but given Delkevic are 1/2 to 1/3 the cost of those big names, and given the results, I really think you get very good bang for buck. Let us know how you go.