With out a tune you aren't really gonna gain a whole lot! With a tune and headers you will destroy them! I had complete bolt on's and with a chip and tuned it myself A/F pro-m adjuster and mac timing adjuster......only put down 240 and 264.........that was a 13.1 AF ration with 4 deg advanced timing.......tuning the car with an SCT dyno tune throughout the whole rpm range netted 58 more rwtq at 4100 rpms and 48 more HP by 4300rpms, A/F was 13.1 after.....with a 25 rwhp peak and 40 rhtw at peak........you can bolt on everything on these cars......without a tune you will be hurting................
"ED"