From conversations with Dan when the long awaited for rears (finally) became available I believe that BMW maintain these are more of a 'cosmetic' than a performance part. Hence dimpled for looks rather than drilled for function.
I was one of the addicts who waited and pressed for the matching rears for looks before ordering the set.
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Yr1 E82 CSM - 6MT, Premium Package, Sport Package
BMW - SSK, Perf Exhaust, Perf Suspension, Shadow Grills Inners, Mudflaps, Alarm, Cargo Liner, Grocery Gripper, Aluminum Pedals, Front + Rear Perf Rotors, MSD80 PowerKit, E93 Sway Bar
Misc -Euro Headlight Switch, Warning Triangle, iBrights, LoJack, Wheel Roundels, Tint, Escort 9500i, Hyper Black ARC8's, Pilot Super Sports
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