What makes an X-Pack version of an Aston Martin V8 Vantage so special? It's all in the engine. Aston Martin developed different stages of the X-Pack, and they ranged in output from 410 horsepower all the way up to a bonkers, 6.3-liter version with 450 horsepower. Only 132 X-Pack editions were made, and none were sold new in the U.S. This 1988 Vantage …
