http://www.speedhunters.com/2013/04/united-nations-of-car-culture-1jz-vw-caddy/
Meh, there's one built for ChumpCar that has an Audi 5-cylinder drivetrain swapped into the bed. If one weren't running under ChumpCar rules it could be a 20-valve turbo.
Oh and the engine in the nose was left in as well, but not run during the race (figured one would fail, so leave the other one and switch to it if needed)
So um, yeah.
Also I've seen pictures of a Box-flared Dodge Rampage with two Turbo 2.2 drivetrains in it. One up front and one in the rear.
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