I've done the free mods & many after market on my KLX300. My bike runs great but I wouldn't mind having some more power. The Dynojet sounds like a sure bet but I don't want to jeopardize what I have & not be able to revert back if the Dynojet doesn't work out. From what I gather from this forum it is reversible if you work on the needle rather than drilling the slide. Is this correct? Thanks.