Porsche 928 GTS · 1992–1995
2,904 total across all markets and both transmissions (most commonly cited figure; Rennlist's detailed year-by-year breakdown records 2,831). Porsche has never published an official total and several specialist sources note that published 928 production figures generally contain inconsistencies. Manual production was substantially smaller — commonly cited as approximately 460 cars — and drives the model's collector ceiling. US-market GTS deliveries totalled approximately 406 cars across the four model years (1993–1995), of which only 77 were manual-transmission.
- Distinguishing features
- 5.4-litre DOHC 32-valve V8 producing 350 hp at 5,700 rpm and 369 lb ft — the largest and most powerful engine ever fitted to a production 928. Flared rear arches to cover wider Cup Design 17-inch wheels, revised bonnet with body-coloured Porsche script, redesigned tail-lights, updated dashboard and door cards, and the option of a 5-speed manual or 4-speed automatic. Halo run-out car of the 928 range and the final development of Porsche's front-engined V8 grand tourer.
- Value premium
- Trades as a separate collector car in its own right rather than as a premium 928 — typically 3–6× a comparable S4 in equivalent condition, with manual cars at the top of the band. Automatic GTS cars sit at the lower end and overlap with the best S4 manuals.
- Inspection points
- Verify the 5.4L M28/49 or M28/50 engine via engine number — this is the only 928 with the wider block, and the only reliable mechanical authentication. Confirm flared rear arches are factory pressings, not aftermarket. Check 17" Cup Design wheels are the factory items. GTS-only interior trim (dashboard, door cards, seat facings) is very difficult and expensive to source and should be inspected carefully for damage or non-original replacement. Confirm timing-belt and water-pump service history — the GTS engine is no more forgiving of neglect than any other 928.
- Authentication
- Verify via Porsche Certificate of Authenticity (CoA) and cross-reference against the 928 GTS register. The combination of 5.4L engine number, flared arches, GTS-specific bodywork and interior trim is the defining factory specification. Several late S4 cars have been cosmetically converted to resemble GTS cars using replica arches — the engine number and CoA are the only defensible proof. Manual GTS cars specifically should be verified against the register given the substantial premium over automatic examples.