Also worth knowing

Its 2.3-litre (S14) engine is renowned for being tough and tunable. In fact, it shares its cast iron block with the M10 engine. Used in Formula 1, this unit is able to withstand 1400bhp with qualifying boost. The 2.3-litre was also given a new four-valve head derived from the M5’s S38 straight six. These four-pot M3s love to rev