What year car, BADVENOM? The later cars don't repond the same to exhaust modifications as the earlier cars did. In fact, Vipers w/o catalyst from 96 (GenII) to 99 have made 45+rwhp whereas the later car w/o catalyst would be lucky to see a 20+rwhp gain from the same components.
I dynoed my '00 FT/10 the day before and the day after putting on my exhaust, on the same dyno and similar weather. Bellanger headers & 3" catbacks and Randomtech 3" in/out cats, I gained 31 rwhp (to 431.3) and 40 rwtq (to 475.2) and it sound a hell of alot better.
My car pulled 402rwhp stock, after the catback it pulled 412. After the headers it pulled 437rwhp and 498rwtq. I dont seem to remember the torque numbers for the first two pulls, I ll try to find the dyno sheets.
On a 98+ car I'm with Larry. GREAT sound, but bang for the buck.....NOT!
I was going the header route, but for $2k, Im still trying to find someone that has taken stock 98+ headers and installed a 3" collector / pipe connection. I might go this route with RT hi flows and B&B catback.
Anyone seen or know of anyone that has done some junkyard engineering on 98+ headers?