[SilverDropTop]

I had the Mufflex 4" Spintech with dual 3" outlets on my old H/C (cartek stage 3 LS6 package) camaro. With that exhaust on, my car put down something like 428 / 415 through the 6 speed. They took the catback off and put on a texas speed rumbler and the numbers shot to 460 / 432. This was done back to back. It sounded great but my car picked up alot removing it and going with a texas speed rumbler (this was all back in 2003).