themselves were also redesigned, with headlights placed vertically instead of the horizontal design on the R89C and R90CK. The cockpit of the R90CK was identical to its R90CP sibling, yet the sides of the bodywork were changed. Most notably, the rear-view mirrors were integrated into the bodywork on the fender, instead of small exposed mirrors on the side of the windshield. The turbo inlet was placed on the front edge of the rear fender, instead of on top of the engine cover on the R90CK. The rear wing was placed much lower on the car, with the rear wheel fender bodywork extending to connect with the rear wing endplates, similar to a style used on the Nissan GTP ZX-Turbo in North America. Later versions For 1991, Nissan officially withdrew from the World Sportscar Championship. Nismo continued competition in the All Japan Sports Prototype Championship, and decided to upgrade the R90CPs to better compete with Toyota and Mazda. The new cars, known as R91CP and R91VP, had slight modifications over the previous car. Most notably, the boxy turbo inlets placed on the rear fenders of the R90CP were made into smaller slits, while a large snorkel was added to the top of the engine cover to cool the rear brakes in place of the previous twin brake ducts. The cars were further modified for 1992 with an upgraded VRH35Z twin-turbo V8, while the cars were renamed R92CP. Nissan ran the R90CKs at the 24 Hours of Daytona following their retirement from the World Sportscar Championship at the end of 1990. For the 1992 running of Daytona, the R90CK's VRH35Z engines were replaced with smaller 3.0L twin-turbo V8s. They were not as successful as the race-winning R91CP. There were three additional unique R90Cs. One was a R89C upgraded to become a R90CP, originally used by Nissan in the JSPC before all cars were completed. Nova Engineering purchased chassis #07 from Lola and initiated their own upgrades to the chassis, calling the car a R91CK. The final modified car was a R90CP bought by Team Le Mans and modified into the R91VP. The cars featured minor aerodynamic differences from the other R90CKs and R90CPs. Racing history World Sportscar Championship The opening round of the 1990 World Sportscar Championship season was held at Suzuka Circuit in Japan, but the new R90CKs intended for the series would not be completed in time for the event.