Hey, I just had a quick question for you all. I have a '99 Cobra that has the basic bolt-ons like Flowmaster xpipe and cat-back, K&N CAI and well thats just about it. I also have 20" Foose Rims that add some weight but Im not loosen thos so that leaves me with a stock heavy car that seems to be a bit sluggish. I have $650 and was wondering what would be the most effective mod that I could do to get me up and going. Im looking for some big acceleration if I can get it. lol I cant even beat this '97 Camaro that I no. Any suggestions?