If your not going to run cats, just run OBX long tubes...thats a 30rwhp bolt-on for $350! I know some people flame them but for a guy like me not made of cash, thats a hard deal to beat! Those headers my not be the best quality, but they are just headers its not a moving part like a rocker arm! Those headers and a Ls9 cam is 50hp at the wheels for 550$ and your labor, thats my plan