OP, the exhaust set up looks great. Your muffler shop really did a quality job.
Originally Posted by Da_Meister_22
Sorry for the dumb question. But you guys are telling me that if in the future I want a quad set up, all I gotta do is change the bottom black part of my rear bumber or diffuser? I don't have to change the whole bumper like in my last E60 530i?
You just have to modify your diffuser (bottom black part) and then get a 135i quad exhaust or have one made. There ill also may be some trimming and modifications required.