If your gonna get headers, then you better get everything back of that upgraded also. The Bassani Catted X will bolt right up with the headers. I've seen afew people's dyno numbers with the Bassani midlengths and it looks alittle disappointing. Pretty much 10RWHP gain. But one guy did claim he gained 20RWHP. I don't know if that was a fluke or not. If it was me, I think I'd go with Long Tubes. Basically the same price as the Bassani's. Just my opinion.