hehe i wasnt talking about the ones for the muffler it is the one that covers the holes in the bumper that you can make it looks like a a aluminum sheet with holes in it that goes on the bumper errr.
hard to explain but its suppose to reduce drag by freeing up the air that gets held back by the inside of the rear bumper
#49051, "RE: str diffusers" In response to Reply # 7
damn i guess they gotta update there website or something cause all they have for str is the dress up crap him i wonder how much they are anyone know any prices?