Subaru Impreza WRX STi

Start with identity, paperwork and originality. For the Subaru Impreza WRX STi, the strongest cars have continuous ownership history, matching numbers where applicable, original books and tools, factory build documentation and evidence of work by manufacturer-approved specialists. 22B STi, RA Spec C, low-VIN JDM specials, original-spec cars (no aftermarket ECU / suspension / interior).

EJ20/EJ25 turbocharged flat-fours are robust when serviced on schedule but ringland failure on heavily-tuned cars and head-gasket weeps on later EJ25 cars are well known. A proper pre-purchase inspection includes cold-start behaviour, ECU diagnostics and fault-code history (where applicable), leak-down or compression testing, underbody photography, suspension and chassis inspection, brake condition and a long enough road test to expose heat-related faults. Deferred maintenance on a car of this class is almost always more expensive than buying a better-sorted example.

Use a paint-depth gauge, lift access and a specialist familiar with the model's factory panel gaps and finish standards. Collector value is dramatically affected by structural repairs, refinished panels, poor paintwork and missing factory trim or option content. Documented cosmetic refresh is acceptable; concealed accident or fire damage must be priced severely.

Originality: documented JDM imports, low-owner cars, original wheels and undamaged shells. Modifications dramatically reduce value. Specification, colour, options and limited-build variants move values significantly. Buy the best-documented example in the most desirable specification you can justify, rather than a tired example of a rarer derivative that will need years of corrective work.