I think most people will use a 5.5 in 4wd and a 6.5 in 2wd unless they are on big open tracks and they may drop to a 4.5 and a 5.5 respectively.
As it is a 5.5 or a 4.5 will light up the tyres under accelleration, a 3.5 would just be too much to handle, if you look at some of neil craggs old setup sheets he used a 7.5 on occassions, so ultimate speed isn`t everything.
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