the in gear acceleration that can be programmed into/created in a vehicle with twin turbos is phenomenal when it is paired with a DSG. the GTR was one of the first cars to do this. before the GTR the TT DSG could do somthing similar but could not overcome the lag created by a single turbo. auto trannies are getting better, though, with their refinement and addition of more speeds- this is why the S8 can rocket the way it does.

it is also the reason why the mclaren MP4 is so phenomenal.

weight loss can overcome the advantage but as you state above the car would have to weigh even less (maybe 400 lbs less!) in order overcome the advantage by the heavier but twin turbo'ed DSG car.

it's too bad audi has had such a hard time with the mid engine TT set up in the R8 model. on the other hand nothing sounds like a 9000RPM redline.