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I'm asking you guys your opinion on the ones you've tried and actually made some sort of difference.now in my bike I have used seamfoan and concentrate tectron.the guys on bike forum swear by those to yet I really don't see a difference in mileage or performance.reason I ask is I have some carbon build up in the ole 460.I kicked her down into passing gear and looked like I black smoked car I was passing.all opinions appreatated.