i am running a 3" 40 series flowmaster, which i like fine, and it sounds nice and deep, but not quite what i want. if your like me and looking for a really tough sound, then do like i'm about to, and get a SUPER 44 flowmaster. i'll be switched over in about 2 weeks. i'll try and get both sound clips if i can. but again, if you want deep and mean, go Super 44 (Super 40 is a tad bit quieter than the 44 if you want that)
good luck