My exhaust system consists of Hooker LT headers, o/r x-pipe, and most recently, Magnaflow catbacks. Needless to say, my car was loud. I also noticed that I lost some low end power. To quiet down my car and regain some backpressure, I purchased 3.5 inch baffles from Bassani. They slipped right into my Magnaflow 3.5 inch tailpipes. They are tightened with a set screw. There is no rattling. The baffles eliminated the high tones but retained the low tones. It sounds great. It also seems like I regained some of my low end power. I highly recommend these baffles to anyone who has straight through exhaust.