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I've done some searching on google and can't seem to find a clear answer. some say yes its legal others say no. and most of the talk about it was from around 2005. please no one tell me its only cheating if you get caught. if I was gonna go that way I wouldn't even ask. I bought some HRC stacks and they are already installed and are at the dyno being tuned now so they're staying unless I find the power curve horrible. I know I'm gonna lose some midrange but I hope its still good enough where I don't have to shift a billion times like on an R6.