I had a rusty factory muffler on my old Saturn SC1. I didn't want to pay for the exact same restrictive muffler. I saw this one for a great price and Dynomax claimed it was their quietest muffler so I decided to give it a try. It's very quiet, barely louder than the stock muffler. I guess the flow got better but I was glad it didn't make the car uncomfortable. That's a win in my book!