Porsche produced 25 road-legal units of the 911 GT1 for homologation.
The 911 GT1 was built primarily as a racing machine for the mid-1990s GT1 category, but the regulations required manufacturers to create a road-going version. Porsche therefore developed the 911 GT1 Straßenversion, a street-legal derivative intended to satisfy the category’s homologation rules. The required total was 25 road-use cars.
The number includes more than one type of road car. Porsche built two early prototypes with 993-style headlights, followed by approximately 20 production examples in 1997 with 996-style headlights. A single 911 GT1-98 Straßenversion was then built in 1998 for the updated racing version. These figures explain why sources may describe the main production run as “about 20” while still giving 25 as the total road-legal number.
Despite its name, the GT1 shared relatively little with an ordinary production 911. Its water-cooled, twin-turbocharged flat-six and rear-mid-engine layout reflected its racing purpose, while the road version retained extraordinary performance. The racing lineage culminated at Le Mans in 1998, when Porsche’s GT1-98 finished first and second overall.