Hi there, jumping nto court post from another BMW forum...
First post!

I took delivery of my X5M50d 2 weeks ago. Fully optioned car in black on black
Loved it stock, but capable of so much more.

Have now lowered it 40mm all round
had a power upgrade completed:
stock = 280 kW / 740nm
Now = 322 kW / 840 Nm
Now has the power it should have had from the factory, the straight M car is quicker from a standing start, fractionally, but hit 2500 rpm and this x5 delivers the torque that pulls away from just about anything.
We've timed it at 0-100 in 4.7, passed 200 smoothly but haven't timed it yet.

Exhaust, weight reduction, brakes and wheels to come, I'll post more as it evolves.