A little about the bike first it a 2003 heritage softail 88b engine. It has a set of Anderson 37g cams and some screaming eagle slip on. It was dyno at 73hp. I have now changed out the exhaust to Bassani road rage 2 into 1 the bike seems to run a little rich at first start or cold start now. When I twist the throttle it blows out a little black smoke. After it warms up it doesn't do it. Do I need to have it tuned or is it fine or should I get a fuelpac controller.