OK I'm ready to be the forum guinea pig with a little help for everyone. I think it's pretty crazy what people are charging for basically mufflers these days. Now I know there is a lot of engineering involved but still. It may just be that I'm cheap and that's fine too but I had the same issue with my e39 M5 and my Z3 Mcoupe. I had a muffler shop put on some Magnaflow mufflers and I couldn't have been happier with the sound. I documented it on the M5 Board
http://www.m5board.com/vbulletin/e39...-mufflers.html.
The help I need is with selecting the right muffler to start with. For the M5 it was number 14816
http://www.magnaflow.com/02product/d...rtnumber=14816. Based on the look of other systems for our Z4 35i it seems like something similar to number 14259
http://www.magnaflow.com/02product/s...=main&id=10748 might be right but I really don't know. That's where I could use your guys help, anyone know the measurements of the OEM mufflers?
As far as I can tell, no one has done this yet for our Z4's but if anyone has suggestions or experience before I start shopping and welding, they would be very much appreciated.
I will of course post pics and videos as I go along even if it turns out horribly, which is always an option
Thanks
Patrick
09 Z4 35i