 At the rear, the rear wing would be mounted high on exposed struts for better downforce.The design and development of NPTI's R90CK was conducted in association with Ray Mallock Limited and the cars were prepared and run out of RML's workshop in 1990, before being shipped to the United States to take part in the 1991 24 Hours of Daytona.The R90CP ("P" referring to the Oppama Nissan plant where Nismo is based) on the other hand appeared to favor a low downforce design.