Launched in 1976, the Mk1 Golf GTI created the hot hatch category. A 1.6-litre fuel-injected inline-four producing 110 PS, ~810 kg kerb weight, red grille trim, plaid Recaro-style seats, golf-ball gearknob — the template. In 1982 the engine grew to 1.8 litres (112 PS). Production of the Mk1 GTI totalled approximately 462,000 units (Volkswagen Newsroom).
The Mk2 (1984–1992) is a meaningfully different car — larger, heavier (~960 kg), more refined, and with better crash protection and interior packaging. It arrived as an 8V continuation of the 1.8 (112 PS) and was joined in 1986 by the 16V flagship (139 PS), which added a twin-cam Oettinger-derived cylinder head, larger front brakes and a firmer chassis set-up. The supercharged G60 (160 PS, FWD) closed the range in 1990–1991. Total Mk2 GTI production was approximately 628,000 units (Volkswagen Newsroom).
Collector positioning: the Mk1 sits as the founding artefact of an entire class and is priced accordingly — original-paint Pirelli/Campaign cars lead the segment. The Mk2 is not merely a continuation but the car that industrialised the formula. Within the Mk2 the 16V is a distinct market, trading at a structural premium of roughly 50–100% over equivalent-mileage 8V cars.
Founding hot hatch (Mk1) and the car that industrialised it (Mk2). Together the two generations define the category, and clean original cars of either are firmly in collector territory.