Quote:
Originally Posted by HIRISC
Hi, sure..I've only got 100 miles on her, but this is my perception thus far:
M mode is a button on the steering wheel changes the throttle response, opens the exhaust up, and can enable or disable DSC (dynamic stability control), the M-mode specific heads up display (if optioned), and EDC (electronic dampening control) 'shocks' via your setup in the iDrive control panel.
- In effect, DSC is the handling nanny - it allows you to drive the X more aggressively eg sliding, etc. Chevy calls it active handling.
- EDC is dampning control - normal or sport mode for your suspension.
Transmission options:
- Standard 'Drive' - just like the E53 - plodding along - comfort mode.
- Sport mode - like the E53, holds gears a bit longer based on your personal driving. Will upshift at redline.
- Manual mode - shift manually - won't upshift for you.
- Paddle - shift manually - won't upshift for you.
At least that's how I understand things 
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Got it

. So essentially the transmission options are utilized by the driver no differently than the E53, except the paddles can now take the place of the shift knob in manual mode. And the 'M' function (as you describe it) is a whole different setup, programmable independently of your transmission choices. Actually, if it's anything like the M3, the 'M' mode should be highly customizable? Keep playing with the M mode and let us know what other gems you find.