 Most notably, the boxy turbo inlets which had been 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 would be further modified for 1992 with an upgraded VRH35Z twin-turbo V8, while the cars were renamed R92CP.For the R90CKs, Nissan ran them mostly at the 24 Hours of Daytona following their retirement from the World Sportscar Championship at the end of 1990.