Hi Olbert, sorry for the delay in responding. The Walker muffler is a little louder than the stock system on my '08 9-5 but it has a deep, mellow tone. One thing I did was to add dual exhaust tips versus having the downturned tip. The previous owner had cut out the rear valence for a larger and much louder rear muffler - which I removed - so I wanted to fill the cutout. I think the dual tips actually made it a little quieter since it directs the exhaust straight back. Personally, I wouldn't buy a used system since it's probably corroded.