The S14 in the E30 M3 ... would be possible if DTM didn’t restrict the fuel flow for the engine. BMW reckons this new turbo ’four is around 100bhp more powerful than the outgoing naturally ...

But the car looked rough and ready, with a simple frame built around the nose to protect the engine and ... a twin-turbo rotary update. That would be the Nissan Silvia S14 front-end conversion ...