Difficult to say about the Schrick VSR gains as originally this was the last mod I was going to do, then I could give a clear verdict. At the time the VSR was added, some Schrick 268 cams found a new home & the head got polished. I know all this made the car responsive throughout the rev range, the performance was another 5mph faster on the Lavant straight at Goodwood One thing I would say is that it tows better!