When it comes to tuning a car, more is usually better. Adding more fuel, more air, and more turbo boost are the typical methods of getting more power out of a car. But what about adding more engines?

I can't believe I'm saying this, but this cute little VW Cabriolet is one of the most exciting cars I've ever driven. Under the hood is the revered Volkswagen VR6 motor, and though it makes only ...