What do you get when you squeeze two more cylinders, nearly double the displacement, and a second turbo into the engine bay of a 1987 Buick Grand National? In the case of Roadster Shop's custom '87 GN, you get six and a half times the original power output. Yes, you read that right. The original 3.8L turbocharged V6 in this car produced 245hp, which made it very quick compared to most other cars of its era. The car seen here produces more than 6.5 times as much power with its 1,600hp 7.0L twin-turbo V8.