I have an 06' vstar custom, assisted installing the maxair kit over a year ago with AIS removed. I did get some HP and torque increases, but not as much as hoping for. 50hp to 56hp and torque from 55 to 60.87 checked on Dyno just to see how it was doing. Maxair site does not trust the Dyno testing or think that the techs do not know what they are doing and go more for the feel of power. I like to see numbers though, I think I can get more out of it, so that will be next. Tweaking the carbs a little more. It does ride very good and always power on reserve even after reaching 75mph, after all it is a cruiser. No reason to go crazy. I've lowered the rear 2in, progressive spring, powder coated black custom 16in apes, blacked out most of chrome, I like the subdued look,also custom 2-1 exhaust wrapped w/ exhaust tape. I would recommend maxair kit, it is plug and play.