...it's real hard to increase performance much by installing a filter, you gotta get main and pilot jetting spot-on...
..also, to fully benefit, you need to raise your carb's needle slightly, which requires some serious manual modifications to the retaining clip...
..also, installing a filter greatly increase the engines sound...really loud!!...which may not be something you want....lol..
..open the airbox, remove filter element, and fire it up..thatll give you an idea of the sound...(your son will like it!)
..dont run it like that tho!..just rev it a lil, then shut it off!!..lol..
..cvt tuning is painstaking, but well worth the effort...
peace