This project is so amazingly bonkers, I love it. It's a home-built radial engine, which, as far as reciprocating engines go, is clearly the most exotic. And, it's built out of engine parts from the air-cooled flat-4 of a VW Beetle.
When we first saw photos of this radial airplane engine being mounted in a Toyota MR2 we questioned whether they were real. This unbelievable video proves not only was it not a hoax, the 1940s era 160 hp airplane engine is in the small Toyota and running (very rich).