After adjusting the CO fuel trim from -10 to 0 I took the bike for a ride and there was no change. The bike runs good for the about 10 miles, then as it heats up to running temp it starts to miss, with two very very small backfires, It sounded like the left pipe. the bike runs poorly under light throttle, but runs strong under heavy throttle. Again the bike ran good before I changed the stock exhaust to mistrals with the baffles taken out.