I'm all for choices for those that need it, but I hope it's optional, as I'll not be ticking the AWD option box.
Make it lighter - great. The motor can stay as is as far as I'm concerned - tune it up a bit if you want for 600+ hp and we're good.
2014 M5 ZCP - Azurite Black over SSII Full
2014 xDrive35d - Space Gray over Ivory/Black Leather (hers)
2011 xDrive35d - Platinum Gray over Oyster/Black Leather (gone)
2009 M5 - Carbon Black over Sepang Full (gone - not forgotten)
2001 740i M-Sport - Carbon Black over Black (gone - not forgotten)