Milltek Sport | 80mm OPF-Back System (Golf MK8 R)MK8R Milltek OPF Back Exhaust (GOLF R MK8) From late 2018, many vehicles have been manufactured with a Gasoline Otto Particulate Filter to reduce further the emissions from the vehicle. The Milltek Sport MK8R Milltek Exhaust Particulate Filter Back range is designed to compensate for the sound reducing qualities from the particulate filter and significantly improve the sound aesthetic of the exhaust system All our performance exhaust systems are