Don't all x5's make a fluttering noise? Not very loud but they do make a fluttering exhaust noise. All 4.4i's and 4.8is' I have heard so far have made a little fluttering noise.

__________________
MY X5 PICS:
http://www.xoutpost.com/members/bmwl...ms-my-bmw.html

RIDES
2005 BMW X5 4.4i Toledo Blue...RIP
Foose Edition S/C Ford F150 #0238
Chevrolet Trailblazer SS
Ford Mustang SVT Cobra