if you get glass packs go with the dynomax.........glass packs aren't created equal.......some of them don't flow real well, they have little louvers or cups that raise into the airstream of exaust flow......the dynomax's don't, their decent, their also louder than hell, which is why they make glasspacks that are almost 3 feet long,( to keep them quiet) which you wouldn't have room for......unless you got goofy with your exaust.....they make shorter ones but, that would be loud i'd think, very, don't think i've ever heard a 5.0 with glass packs.........lol......might sound interesting....