So far we just have cold air induction system, long tube headers with 1.75 in. primary tubes and 5-to-1 merge collectors, no cats and 2.5 in. mid-pipes flowing into 2 high flow stainless mufflers. The rear section of the exhaust is stock all the way down to the tips. We got 472 rw hp and 500 rw tq with a heat soaked motor. We are doing a custom VEC program the mods above and it is entirely possible that we could see 500 rw hp once the computer is tuned. Our air/fuel ratios on the 472 rw hp run were 11.2 which is pretty fat for NA. Considering that a stock Ram SRT10 maybe makes 430 rw hp on a good day, there is quite a bit of upside with these bolt-on parts.