I have a 535i 1990 E34. Has anyone ever tried to fit an 4-pipe output exhaust? I mean 2-pipes on both sides in the back of the car. The factory exhaust is already dual-piped from the start. Is it possible to have the other pipe "moved" on the other side of the car, and what does it need to get it attached properly.
I would be very pleased if anyone could help me with this.