I recently installed a flowmaster 80 series w/ gutted cat and 2.5 duals out the back on my 91 camaro 305. The sound is good but at idle there sounds like and exhaust leak coming from the cat. Asked the muffler guy about it and said it was coming from the air pump and there was nothing to do about it to keep it emissions legal. Does anyone have any ideas or problems with guttin the cat on their third gen??? Any help or ideas on how to fix this problem would be greatly appreciated....the tst...tst...tst is killin me!!!

Camarokid1991
Va