Plug it and go play
Plug it and go play Having spent some more time away from the bike I was left thinking: Sealing the exhaust up hadn't stopped it popping so what was causing it? "Well popping is caused by air getting to the exhaust so either you did a crap job of tightening up the header pipe or it's the PAIR system" I thought to myself. The PAIR valve allows fresh air into the exhaust system to continue the burn of the exhaust gasses on their departure to lower the emissions. This should create no problems with the standard end can but put a straight through can on it and you might get popping and banging on the overrun. Maybe I needed a step back from the bike to see this but I thought what harm can it do to try? as it happens the task is quite reversible and doesn't cost anything to simply block the system and if it works I might go ahead and remove it completely. PAIR valve isolation With the aid of the Haynes manual and this guide from VFR discussions I got to