Quote Originally Posted by 330i ZHP View Post
I was SOOO happy to go back to the stock manifolds on the sedan. I was tired of dealing with O2 issues, or the O2s rubbing/knocking against the bottom of the car, the drone (the only time I didnt have drone - was the Supersprint headers, into SS cats, into SS x-pipe, into SS resonator and finally into SS rear section)

The wagon currently has SS headers into Euro M3 exhaust/cats and then finally into AA Gen6 M3 rear section - it is as raspy as any modded M3....I want to go back to oem cats - but the TS3 would choke on its exhaust

I am beat down enough on exhaust I am weary of getting the down-pipes for the X5M
I have seen quite a few x5M's in my area. They are a very very nice car, probably the one suv that would hesitate me from a G55 AMG or the Porsche Cayenne GTS.

@ op. I think headers with any aftermarket exhaust will be LOUD. And if you use no cats, the car will probably stink if gas after you drive it..