So I know there once was a time when that was a stock option on older models, and from what I understand Scion TC's were based on a frame which already had space for the new drivetrain to make them RWD or AWD.
So how impossible would it be to do this type of swap to a 7th gen celica? Could you use the standard engine?
I'll never be able to do this of course, but it would be pretty neat to see it.