Need exhaust system help, Who sells the quietest two and a half (2 1/2) stainless exhaust system for my 87 GN. I currently have a 3 inch ATR system and pit bull muffler on the car and the drone noise drives me crazy. I am done racing the car , so I don't care if there is a little performance penalty. The car will only be street driven for as long as I own it. Thanks, Jack.