Hi guys I recently ordered a full Yoshi r77 exhaust system for my bike, I was wondering if any one could could tell me of any problems I might would have. I'm not sure if it deletes the o2 censor and if that would be an issue if it does. There's also the little butterfly valve that closes at lower rpms. Those are the concerns I have, if they're any more issues I need to be aware of please Inform me. I do have a PCIII already installed for the hmf slip-on that's on the bike now.