First congratulations, and great find!
When was the last time fluids in the car were changed? If they're the original fluids, you might want to change the oil, brake fluid, probably transmission and differential fluids as well.
The Rogue exhaust has a lot of drone. It sounds really great from the outside, but it can kind of drive you crazy on the interior. That's the case with many of the exhaust systems available for the Z4M.
We have quite a bit of quantitative data on this. Please see the following threads, with data sheets, and videos.
http://www.zpost.com/forums/showthre...hlight=Exhaust