This FD RX-7 has lost its rotary engine. But it found a 621-horsepower 4.1-liter V-6 out of a Buick Grand National. The thing has a monster turbo, methanol injection, and runs the quarter mile in 10 seconds. Oh, and it gets 30 miles per gallon on the freeway. Oh engine swaps, how I love thee. It’s up for auction on eBay here.