GTIspirit, what are the smog requirements for your state? On my Mk1 Wabbit, I just use a 12" flex pipe, to a 24" cherry bomb glass pack, to a 45 degree down pipe, and exit the exhaust right in front of the rear beam axle. Of course, this car isn't driven on the street, but it has NEVER had a problem with exceeding 103 db on the track.