The 4" aluminized kit I got from Gus at Farmboys was excellent. Its made by Expandit and like I mentioned in another post, the guy that helped me out is an MBRP vendor and said that after seeing how well mine was made and all fit together he wouldn't be getting any more MBRP's. I'm not trying to bash MBRP because I have no personal experience with them but this guy has installed a lot of exhausts and so I take his word for it.