In 1968 the chassis was improved to make it more rigid and give it a more adjustable rear axle design.
In 1969 the car was redesigned again, this time to increase performance, but only six were made due to rumours about changes in the Formula Vee rules.
The prototype car did well in races, but was plagued with engine problems and the rear end of the chassis had to be redesigned.
After the redesign it worked better and the driver Bror Jaktlund managed to finished as number 3 in the European championship, even if a crash forced him to skip the last race.
It was a low, two seated kit car with gullwing-doors inspired by the Ford GT40 and made for a Volkswagen Beetle chassis.
The dealer in Finland had orders for more cars so he bought the rights to the RPB GT and made new molds from one of the delivered cars, but with desedigned rear and a 5 cm higher roof, and continued production for some years.
RPB withdrew from car making and instead produced other plastic products such as bus interiors and snowmobile parts.
The Finnish mold was sold after some 20 cars were made and later changed hand several times.