Hello community. I’ve been driving a 3.3 GT year 2018 – so still without OPF. It’s a Bastuck exhaust system without flap installed. The system roars extremely at load between about 1,500 and 2,500 revolutions. When driving longer in this area (e.g. uphill drive on the highway at 130 km/h speed limit) you get really headaches. I really think about whether I have to build an original system under it again. Does someone have the same problem or can you here Abhi I’m grateful for every tip.