Picture heavy post incoming! Skip this post if you don't like detailed pictures of rare Century secrets

Looking at the top of the rear seats you see three audio speakers. Right?

Wrong!
The center is a subwoofer and the two side grills are actually vents. One air intake and one cooled exhaust.
Let's take the back cover of the trunk off. You see the fuel tank. But on top?

A separate air conditioning unit for back seat passengers! Complete with air filter, blower motors, and condenser.
