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.

 

I like Lucas Injector Cleaner. If it doesn't do anything else it lubes the in-tank fuel pumps.
Craig

 

I use Seafoam when I cannot get my hands on BG 44K.