Open pipes/no mufflers. that'll give you the loudest exhaust, but it won't be that loud with the stock cats in place. It will sound better, though.
Mike -- 2005 "The Beast" (Formerly a V6, now a forged/stroked 5.0L V8 sportn' a Kenne Bell 2.6L @18psi, and many mods
2006 4.0L w/Powerhouse turbo and TR-6060 :kooky: