I've only ever seen photos of these twin turbo G's with no rear bumper/bodywork.
Surely they can have it? It just seems odd that i've never seen on with rear bodywork, unless the heat and packaging problems prevent it, which surely makes them illegal on the road...
The bumpers are off purely for show to see the turbos and the beauty of the qaulity of work thats all, the cars have the rear bumpers fitted before being set free on the road.
There's a video on Youtube that I'll dig out this evening from Heffner in the US; it's a back to back with a standard R8 V8 launching and running up through the gears then their twin turbo conversion straight afterwards. The damn thing pulls through 5th like it was 2nd O_o
