This is what happens with a slip-on muffler and a RAMAIR and no tune. Despite all advice to the contrary this guy brought his bike in on a trailer. I let it idle for a while until it was up to 80 deg C , then rode it gently to warm the tyre etc before baseline testing the bike. Up to about 1/4 throttle, almost no load and the ambient temp was 19 deg C and I had 75 km/hr wind in my dyno room. LEAN as all get out. 2016 Rocket X. This is why I cringe, when I read, "yeah do this it will be allright mate" or similar pearls of wisdom. Thought this may be of interest.