There's way more to jetting than it making the bike able to wheelie. The performance part of it is to make your bike run how it should based off your areas elevation, temperature and humidity. It's not made just to get power gains but usually turns out that way. If you feel your bike isn't running lean or rich then that's your call. It's better to be on the rich side more than lean but jet kits dial your carb in to the correct balance.