Looking at some of the pics of the latest FW33 from Williams it seems that the rear end – where the gearbox goes has been radically developed – reducing it's sice.
Compared to last years car it appears to be mostly air.
http://www.f1fanatic.co.uk/2011/02/01/valencia-testing-day-1-in-pictures/barr_will_vale_2011-2-2/
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