Every car is an argument about what matters, and the Jaguar XJR-15 makes its case with 6.0  and 456 PS. Jaguar built from 1990 to 1992 — when airbags, anti-lock brakes and Japanese build quality became the world standard. Its designer of record is Peter Stevens (car designer) / Peter Stevens / Tony Southgate.
The story
The Jaguar Sport XJR-15 is a two-seater sports car of which a limited number were produced by JaguarSport, a subsidiary of Jaguar and Tom Walkinshaw Racing, between 1990 and 1992. Only 50 were planned (although 53 chassis were eventually made), each selling for £500,000. The chassis was mechanically based on the Le Mans-winning XJR-9, designed by Tony Southgate.
The body of the XJR-15 was designed by Peter Stevens, who went on to co-design the McLaren F1. The car competed in a single-make racing series called the Jaguar Intercontinental Challenge, which supported three Formula 1 races (Monaco, Silverstone and Spa) in 1991. The XJR-15 was the world's first road-car made entirely from carbon-fibre.
What is underneath
Under the skin sits 6.0 it is rated at 456 PS. Kerb weight is 1050 kg. Power-to-weight lands near 434 horsepower per tonne, which is hypercar territory, where the limiting factor is the tyre, not the engine. The gearbox is a 5-speed Manual Transmission / manual / 6-speed manual (racing version). The wheelbase is 2718 mm. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Its place in the line
Where it sits in Jaguar's history is not in doubt: the Jaguar XJ220 followed it; it was built at Bloxham, Oxfordshire, United Kingdom. On a showroom list of its day it stood against the Dodge Viper, the Ferrari F40, the Lotus Carlton. Nearby in the Jaguar catalogue sit the F-Type and the Vanden Plas.
The money
EPA combined economy is 21 mpg, about $4,450 a year in fuel at the EPA's assumptions. Condition, mileage and specification move any single car a long way from a headline figure.