http://racetruck.tripod.com/muffler.html Here is an interesting web page I found while looking for a new muffler. I replaced my muffler at five hundred miles with the rhino and loved the sound,but it is a little loud at cruising speeds but sounded great.when I had my car dynoed everybody loved the deep throaty sound,but alas at 75000 miles and eight years later it has rusted out,so Im looking for something that sounds great at idle and acceleration but radio friendly at cruising speeds. Sorry you have to copy and paste,couldn't figure out how to post the url direct.