Apart from that, the BE goes out and then you can’t drive in public road traffic anymore… What does that mean to remove the cats and replace them with simple pipes (cat replacement pipes). Some of my people have done this and report a noticeable increase in performance (S8, S6 and an A8 4.2) What about it? Or is it just the subjective impression because the car is getting louder… I have expressed my concerns about the exhaust flow of the vehicles? but exactly adapted to the engine is right? Please don’t have any instructions, one should know something more precise, especially in the V8 >300ps class then please get the information. Greetings from the capital Schulle