As Ian said there is not much difference between 13.5 and 10.5, 17.5 however, would be slower. You have to remember that if you win the 17.5 clubman then move up to modified, you would get the fright of your life as soon as you touched the throttle. Perhaps then you are looking at 3 classes, Begginer 17.5, Intermediate 10.5 and then Modified. This in my opinion would be the way to encourage new members.
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