Is the Alfa Romeo 156 a good investment?

The thesis

Just 1,678 Sportwagons built globally, with ~100-150 RHD examples in UK—genuine rarity. The 3.2 'Busso' V6 is among the most sonorous engines ever made, 250bhp, manual gearbox, practical estate body. The 156 GTA saloon already trades £20-30k for good examples, but the Sportwagon commands 20-40% premiums when clean examples surface due to scarcity. Critically, the market hasn't discovered these yet: Italian metal lacks Porsche liquidity but the GTA's motorsport homologation story, limited production, and last-of-Busso status position it identically to cars that have already doubled.