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All I'll say is just get whatever you want, everyone is always going to argue about which one is best, so just get one that looks good, sounds good, and is priced right.
i have an '03 kfx400 and am buying a pro circuit T4 full exhaust. Anyways, what air modifications do I need to make to account for the new exhaust?? I understand that it will have to be jetted, but do I need a k&n air filter and all that??