[gallery link="none" columns="1" size="full" ids="83793"] source: Unitronic Unitronic is proud to release its Cat-Back Exhaust System for the MK8 Golf R and 8Y S3 equipped with the 2.0 TSI EA888 EVO4 engine. This Valved Cat-Back Exhaust System features 3-inch T304 Stainless Steel mandrel bent tubing, high density, high temperature fiber glass packed muffler with acoustic design inspired by the OEM Audi Sports Exhaust for the 8V.2 RS3, your choice of polished oval, polished round or black PVD, ro...