GPF-back-system consisting of 2 connection pipes and sport exhaust L/R centered (without tailpipes) with 1 integrated valve, incl. CE approval incl. mounting material Connection to the front parts at the manufacturer's connection point Installation/mounting on stock mounting points Original tube Ø 65 mm - REMUS tube Ø 76 mm The activation of the valve is done by the original actuator via the vehicle's on-board electronics.