To answer everyones questions.
No I did not hear the exhaust since I was in my office building.
For anyone that knwos L.A. street traffic (let alone at Sepulveda and Ventura) he was NOT driving fast at all, though the car looked nice.
I see the car heading West on Ventura through Sepulveda quit often, and more often than not it's between 10am-12pm.
Yes, BMW has a testing facility up in the Ventura County area, and more importnatly the BMW NA Design Works is in Newbury Park, which is a northern suburb of L.A. It's about 30 minutes North of where I saw the car on teh streets.
2009 E90 M3 | Silverstone II | Black Novillo | HRE P40's | Akrapovic Exhaust | Eibach Pro Kit | Jet Black Kidney Grilles | SSII Side Reflectors | SSII Side Gills | LUX H8 Angel Eyes | Macht Schnell Filter | Tecnocraft Envy Charge Pipe
"M3 drivers have no friends." - Jeremy Clarkson