Do u have a gtp or a gt? Honestly if u can buy used stuff. I check on craigslist regularly and a lot of guys on here are sellin their parts for cheap. I would start with the basics like 180 tstat for $10, make ur own fender well intake for $50 tops with spare tubing or going to ace hardware for pcv tube. Then I say exhaust. Go with a better flowing downpipe. That will also get rid of that crappy u-bend before the carback. That helped me a lot. Get an off the shelf pcm. $100 and its worth it. And if u can get a front powerlog. It replaces the stock front manifold. Anyone else?