Porsche Cayman GT4 (981 & 718)

Start with identity, paperwork and originality. The strongest cars carry a continuous Porsche or recognised-specialist service file, matching numbers, both keys, complete books and tools and — where available — the Porsche Certificate of Authenticity and factory build documentation. For both GT4 generations, prioritise fully documented Porsche or specialist service history, original paint, manual gearbox where available, and an unmodified car. Track-day history is not a disqualifier where it is documented and the car has been maintained accordingly; undocumented track use is a red flag.

Inspection should be led by a Porsche GT-model specialist. Verify full PIWIS diagnostic history, cold-start behaviour, cooling-system integrity, clutch condition (manual) or PDK behaviour, brake condition (PCCB weight and thickness where fitted) and evidence of contact on splitter, sills and diffuser. A proper pre-purchase inspection includes cold-start behaviour, an undertray-off inspection of the engine and gearbox, chassis and suspension survey, brake condition and a long enough road test to expose heat- and load-related faults. Deferred maintenance on a specialist Porsche is almost always more expensive than buying a better-sorted example.

Use a paint-depth gauge and a lift inspection. Confirm any PPF history; inspect splitters, sills and undertrays for evidence of contact; and price concealed accident or corrosion damage severely. Rust in wheel arches, sills, floors and battery-tray areas is the primary body concern on the earlier cars.

Specification, colour and factory options move values meaningfully. Buy the best-documented example in the most desirable specification you can justify rather than a tired car of a rarer derivative that will need years of corrective work.