I'm sure I've seen e39 Xi's around. Possibly not the 540, but defintely 5-series. I had been looking @ a 530/535 (can't remember) before purchasing my 330Xi. Was actually thinking 5-series (and quite possibly Xi varient) for next vehicle.
DCT Electronic Shifter
Bilstein and H&R sports suspension, Rogue Enginerring Race Brace
AA Stage2 tuning
Conforti CF Cold Air Intake
Hamann Front Spoiler and Side Skirts
BMW OEM rear wing spoiler.
M3 SMG Paddle Steering Wheel and M3 Seats
18" M6 custom painted wheels
Custom red kevlar interior
VIS CF Hood