Unfortunately I won't get to see my car for another 7 months, and I was wondering if someone could take a look and tell me if their pre-facelifted Z4 has secondary cats. I was under the impression that it didn't, but I've found pictures of Euro and Australian cars WITH secondary cats:
Euro:
Australian:
My car, from the passenger side FCAB looking backwards... sorry, I pulled it off my Facebook and it's the only pic I have:
It looks to me like I have a dual in/out resonator. I'm replacing the headers and don't want to run catless. I've been offered a great deal on a Supersprint muffler, but it requires a connecting "Y pipe." I'm having a hard time finding a single cat that can handle 350 hp and has a large enough inlet/outlet to weld in.