Hello people my father has recently grown a Cayenne turbo s the car is really a balance, exterior, interior and driving performance are really top, only the motor sound reflects my opinion not quite the concentrated 521ps. have already asked me at speedart and techart for a flap exhaust system, but the prices are exorbitantly high (at about 3990€ without mounting). do you have a cheaper system in mind? would help me a lot. many thanks already for your labor. lg mirko