Metro Prowler - Words Fail Me

It's best just to show the picture:

A Geo Metro came as a front wheel drive car with a three or four cylinder engine.
A Prowler came as a rear wheel drive car with a six cylinder engine

This car has side pipes - indicating at least four cylinders on this side of the car.

• Did they drop in an eight cylinder?
• Did they put in a four cylinder and the pipes are only on one side (I doubt this)
• Did they leave the stock engine and add nonfunctioning pipes

These are just a few of the questions this picture inspires.