I had an X drive 335 and then got the rear wheel drive 340 which comes with the 704 M sport suspension and significantly improves the driving experience, in my opinion. Including the shift from the N55 to B58, true night and day difference. Only reason I got rid of that car was to move to the F80. Still love the 340 and keep in touch with the new owner, great car. Tommy L daily drove his F80 in the snow, so it can happen.
M550 or M5?