I think 6.9 is doable in the stock form, with 16" alloys and no sunroof. I think when you add the other equipment on and the heavier wheels the car becomes a couple of tenths slower. With the right launch technique and a bit of practice under 7 seconds is very possible. Garfield has managed to get his car down to 6.1 and all he has changed is the exhaust (a supertrapp) and the alloy/tyre combo (SSR Comps with Falken Azenis). He just gets the launch right and away he goes.
check out this thread:
http://www.mini2.com/forum/showthrea...ghlight=launch
And this one before the supertrapp was installed is just great as a comparison:
http://www.mini2.com/forum/showthrea...ghlight=launch