I don't but it definitely would be drivable.
I have a VolvoS60 heavily modded pushing 300+whp. FWD, no LSD or XDS - it takes a special touch and balls, but it is drivable.
VW made a W12 GTI and top gear tested it...
This might of started the driveability rumors
http://www.youtube.com/watch?v=wlu5BS0jtMk
Don't they have a problem with the clutch and transmission if they go over 200bhp. I'm told the GTD will go to 195bhp anything after the clutch and transmission will be unreliable.