if your going to be at Ft Meade in MD, there is At Speed Motorsports in Hanover, MD which is right next door.
They specialize in BMW and Porsche. They are also a DINAN authorized center, and all have Active Autowerkes stuff, amongst other things.
'06 BMW E46 ///
: '08 BMW E60 DINAN ///
M5, Interlagos Blue, SMG
DINAN Stage 2 Suspension, Exhaust, Stage III Software, Front strut braces,
Intakes, 13% Underdrive pulley, 3.91 Differential, RPI Scoops.