I already have my muffler cut off, im just wondering if it would make it sound any louder with out the CAT. i pulled next to a 01-02 DMAX dually one day down here in aggieland, he didnt have a tailpipe, so i guess he had a "dump" but this thing rumbled at the redlight. he didnt try to run me though, SKEERED, but it was really loud. Im talking it was as loud as a stock cummer. anyways ive just been trying to get that sound now, i tried cutting the pipe at the end of the cab, didnt make a difference at all, actually just like stock, so i put the rest of the pipe on with a 5" tip. besides that one, im the loudest Dmax in town. anyway, thank yall for this. ive told all my buddies about it.