Going to do a top end rebuild on a used 2009 yz450 and was looking at going back either stock or considering the CP high compression piston kit. I was wondering about the pro's and con's of the high compression? I know OEM is practically bullet proof and I've heard good things about CP products so I really could go either way here. Would I have to run race gas if I went high compression? Also does the high compression piston change the power delivery in any way? Is longevity an issue with the high compression? Any feedback is much appreciated. Thanks in advance.