1995 versions of F1 GTR generated enough downforce to run along the ceiling at 100 mph. The interior was stripped of all luxuries and given a full racing cage. Carbon brakes replaced the stock units. Because of the rules at the time, the BMW S70 V12 engine was required to use an air restrictor to limit power output to around , making the racing car less powerful than the road car, yet faster and more nimble due to a lowered overall weight. Features such as the central seating position, Butterfly doors, and even the standard gearbox were retained. McLaren co-ordinated a 24-hour test at Magny-Cours to find weaknesses in the car and develop upgrades to supply to the teams. A total of nine chassis would be built for the 1995 season, with #01R being retained by the factory as a test mule, except for a one-off use by Kokusai Kaihatsu Racing at the 24 Hours of Le Mans. British team GTC Racing received two F1 GTRs, with a third being used to replace a destroyed car. David Price Racing, BBA Competition, Mach One Racing, and Giroix Racing Team would all receive one chassis each, while the final chassis, #09R, was sold to Hassanal Bolkiah, the Sultan of Brunei, for his car collection. At Le Mans 1995, the Kokusai Kaihatsu McLaren obtained victory and the highest practice top speed of the year, reaching 281 km/h (174.605 mph) on the Mulsanne Straight. Following the success of the 1995 season, McLaren set forth to upgrade the car to remain competitive, especially against the threat of newer sports cars appearing such as the Ferrari F50 GT (which was withdrawn quickly) and the Porsche 911 GT1. They were assisted by BMW Motorsport, who at the time decided to use their connection to McLaren to enter sports car racing by running their own race team with F1 GTRs. Among the modifications were an extension of the front and rear bodywork, including a larger splitter attached to the front of the car. The bodywork was also modified to allow it to be removed more quickly for easier repair. The car's standard gearbox was modified to include a lighter magnesium housing and more robust mechanicals. These modifications allowed for the weight of the GTR to be lowered by 38 kg. Due to demand, nine more new GTRs were built, while two older GTRs (#03R and #06R) were also