So I rode it like 3 hours ago and everything was fine. I turn it on just now and sounds very choppy kind of like a Go Kart. Rode it down the road and it remains super choppy until I get going to about 30-45 mph and in 2nd-3rd gear. Then it is back to normal and very smooth until I get back down to slower speeds/gears. When it makes the switch from choppy to smooth in the middle of a gear it feels kind of like there are bubbles and then it feels like a bubble gets popped and then its back to smooth (sounds like that too in my exhaust). Any help is greatly appreciated!