As far as the additives go I know alot of people say they are useless and dont do anything. But I have seen first hand through tuning and using knock headphones on these cars that it does help you. Now this is a boosted car that I am tuning right to edge of knock. But I have tuned it, filled up and had it knock, threw some additive in and the knock went away.
Again its just what I have seen/heard personally. I know many people will disagree.
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