On too a few rumours, maybe someone can shed some light on these.
Apparently the first batch of 20 cars were supplied without sound deadener. These cars were to be the racers with the others being built just to make up numbers. Not as much attention was lavished on the road going cars.
I've also heard over the years that the racers were only given a light coat of primer and paint to help save more weight.
The camshafts seem to be a point of debate aswell with the racers possibly receiving a hotter cam than the run of the mill versions
