For those who don't realize what test mules are, they are just cars used to test systems before production.
Early ones generally use modified chassis from existing models, hence the reason you see a shortened 350Z.
In comparison, here's an early test mule for the Jaguar XK, using a shortened sedan chassis.
Here's another XK mule, farther towards production. It has the production body covered up by camoflage. Expect to see the new nissan in this stage in a little while as production gets closer.
