The sales success of the GT6 Mk1 spurred Triumph into fixing the rear suspension problems and updating the car to meet U.S. safety standards. 80% of the cars were being exported and despite the rear suspension problems, the car was more popular than the MGB GT. The Mk2 provided a complete car. Once again, Harry Webster wanted the car to be further inspired by competition so in 1966, a six cylinder version of the Le Mans Spitfire was built. Triumph’s project manager, Ray Henderson built a car that produced 200BHP and had a top speed in excess of 150MPH. But at this point in time, the GT6 hadn’t been homologated and would therefore have to compete in the prototype category against the Ford GT’s, Ferraris and Porsches. What a pity as Webster decided to withdraw from the event. The prototype was called the GT6 R and its survival is unknown and is doubtful.