Took the cat off and got rid of some heat. Sound good just a little more throaty but not any louder driving at 70mph. Little louder at lower speeds like at 20 to 30 mph but not much. Also the cat must have weighted 20 lbs.... lost that weight. Seems a little more responsive. Lamonter... thanks... good quality produce no problems on the install except the top spring did arouse my competitive spirit there for a while.