600 bucks, what speed parts should I get

[dinomite]

your best bet would be to get gears, underdrive pulleys (do you have a 130 amp alt? if not, get that with the pulleys) and a k&n. if you need to get the alternator, that might stretch it (you should install the pulleys and alt yourself), but thats your best bang for buck. the full exh. is closer to $1k (headers, H, and cat-back) so tahts why i say wait on it, and do it all at once, correctly.