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One answer if it is from HD, the Heavy Breather is the choice. I have a stage IV 103 already, and I bought it AFTER I found the first purchase of an AC, an SE Ventilator which wouldn't let me get beyond the 100 hp mark. They had it off when I went into the dyno room and were proving that it was the AC. I went to parts and grabbed the 58mm version of the Heavy Breather and we slapped it on and and ended up with a very good running around town bike and it has very mild behavior, however,117hp/111tq will act up if you twist the grip!!!!! I can smoke the tire in first or second , pull the front tire off the ground without much effort, and triple digits rightnow!
I ride with nothing extra weight to fully loaded and a passenger and the motor is a delight to run with the mods! Very fun still not a sport bike, just working on the total handling package now to get it better at flicking it from side to side through multiple corners and not feel the weight as much!
Good luck and have fun with it!!!d
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