From what I have seen a lot of the issues with some of these kits have to do more with the installation than the kit itself. That being said I know of a couple of guys that had issues with cylinder base gaskets leaking and went through a few before finding something that worked. That being said I probably would not go that route myself since all of the bike's systems (cooling and transmission come to mind) have been designed and tested around it's stock configuration. Then again that is me. I say if the setup works for you then just go out and enjoy the ride and don't worry about other peoples opinions.