ProBoost is a company in Saarenkylä, Finland that specializes in turbo kits for motorcycles and snowmobiles. They also build custom motorcycles for drag racing or street use. Their newest creation is powered by a twin-turbo 4.0 L BMW M60B40 V8. It makes 282 horsepower and 295 lb-ft of torque naturally aspirated but should make 400-500 horsepower thanks to the two small turbochargers. The build required a custom fabricated frame which they sell for $2,400 if you want to build your own.
Source: ProBoost (build album)