Porsche 991.2 GT3 R (GT3 Class) w/ Unmuffled Exhaust: Pure 4.0 N/A Flat-6 Sound! Drag & Track by turboandstance - April 2, 2021December 9, 2022 I think I've never explicitly said it but unconsciously there has always been a small desire to be able to hear one of the GT3-class Porsches with a fully unmuffled exhaust. The opportunity happened last weekend at Mugello Circuit during the 2021 12h of Mugello race organized by Creventic as the