Is the Porsche Cayman GT4 a good investment?

The thesis

The 981 GT4 is the last mid-engined Porsche with a naturally aspirated flat-six and manual-only offering—the 718 GT4 successor went turbocharged. Priced at £64k new, current UK market is £55–75k, sitting well below your budget floor but representing exceptional value per horsepower. With GT3-derived suspension, the revvy 3.8L 9A1 engine (385hp, 7,800rpm redline), and Weissach pedigree, it offers a pure, analogue GT experience. Production limited to ~2015–16, roughly 2,500 units globally. Market has been stable to gently rising; entry-level GT Porsche that's appreciated modestly but hasn't run hard yet.