I installed the Stain Tune system two weeks ago, the fitting was real simple, all the bits went together nicely and the bolts line up correctly.
The sound, well on the bike it is not very loud at all, I am surprised when I read on the forums where people say they are loud, I could not agree with that. May be I will have to have someone ride the bike for me so I can have listen from the side of the road, when the throttle is opened up your certainly can hear them then but still not as crazy as many Harleys.
I think I was hopping for something louder but I am pleased with what I have.
Performance, certainly it revs much quicker and pulls much better and I have not changed the tune at all yet.
Next step it search for tune and try one, then a PCV and dyno tune and I should have it the way I want.