The Alpina D3 Bi-Turbo Coupe is a 3-series BMW really should make. To create it Alpina, the Buchloe-based tuner, tweaker and BMW bedfellow takes a regular 3-series coupe. It then drops in the twin-turbo diesel engine from a 123d, makes a few changes and the result is an engine with more bhp per litre than any other BMW road car.

But Alpina is well known as a maker of fast and understated M Division-rivalling BMWs. So what happens when the company turns its attentions to diesel? Will there be an agricultural rattle to spoil everything? Read on to find out about the Alpina D3 Bi-Turbo Coupe.

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