You also have two subs--one under each front seat. That brings your total to at least 9.
I think the other two speakers you missed are in the back seat. In the coupe, there are two speakers on each side in the rear (one tweeter + one mid range).
PCD 12/21/2010: 2011 335i Coupe 6MT | Black Sapphire Metallic | Saddle Brown Dakota | Premium Pkg | M Sport Pkg | Harman Kardon | Navigation | iPod/USB | Sirius | Smartphone Integration | Heated Seats | Comfort Access