I just threw my Magnaflow back on the other day since I'd had it with all the noise. It's straight through and I'm always amazed by how quiet it is for a straight through. It's not silent like a stock cadillac CDV or something but way less noise than no muffler to be sure. I can't tell a difference in performance with and without but it sure is nice to once again have the ability to go WOT again without attracting all the heat in the county. I'm sure the neighbors like it better.