Is the BMW M3 a good investment?

The thesis

The E46 M3 is the last naturally aspirated straight-six M3 with hydraulic steering and a pure, analogue driving experience. Manual coupes have doubled in value since 2019 and continue to appreciate, with quality examples now commanding £20,000–£35,000 in the UK. It's deeply usable, four-seat capable, and benefits from BMW specialist support. The S54 engine is a masterpiece, and the market has recognized that 'the last simple M3' offers modern classic status without the complexity of later generations.