Not dyno'd yet road it home with the old tune for single 1-3/4 muffler. This muffler is 2-1/4 reducing to 2 just inside can. Not one pop. Running a bit rough just off idle and a little bit of black smoke Mabey a little rich. Put Ramair on this evening that plastic thing is never going back on. What a pain in the arse to get off. Had trouble getting the Ramair to stay on Lushy told me to wipe the rubbers with a petrol rag to get the oil off and don't over tighten the clamps. That's where I was going wrong every time I tightened the clamps it would pop off. Ended up just sat it on for a while then tightened a little so far it hasn't popped off. I'll check it again before I take it to get dyno'd probably tomorrow if I get home early enough.