ProBoost is a company in Rovaniemi, Finland that specialize in turbocharging motorcycles and snowmobiles. They also build some pretty wild custom creations such as their ProBoost M1 motorcycle powered by a twin-turbo 4.0 L M60B40 V8. The bike’s success might have something to do with a customer asking the company to build a custom Trike also with a twin-turbo 4.0 L BMW M60B40 V8. The engine, automatic transmission, and differential/subframe come from a 1995 BMW 740i (E38). You can follow the project’s progress on ProBoost’s FB build album.
Source: ProBoost FB page (build album)