The T.50s Niki Lauda uses the 4.0-liter V12 like the standard model.The output for the hotter model is 701 horsepower (523 kilowatts) at an outrageous 11,500 rpm, but the roof-mounted ram-air …
https://www.motor1.com/news/489878/gordon-murray-t50s-niki-lauda/