Borlas do look like a glorified glasspack, but somehow they get them to sound good and last a long time. A friend in Houston had a Fury with a 408 and Flowmasters. A nice car but it sounded like a rattle can. He got tired of the sound and put on Borla XR1s and I could not believe how nice it sounded. When I got home I ordered up Borlas for my car. They've got a nice deep rumble at cruise, not too loud, but really produce a nice deep roar when you hit go.