I'm with Gayo on the piston sizing for 4wd.
Nick is a very smooth driver and strokes a car around so can get the benefit from running a softer damping setup (we we always a piston or so different on the standard shocks too).
If I, with a much more agressive driving style, try to run that soft I find that car feels a little unreactive but the big holes sure seem to work well for Nick & Colin May!
I think it is like many other things in this sport .. you need to put the work in yourself to find the setup combinations that work for you. Of course people like Nick & I are more than happy to advise what our experiences are and what a change should do for you.
I've not done much work with the big bores on the 2wd car but I certainly believe that I personally would want less piston flow area in the front shocks than is offered by the stock pistons (5x1.3 by my measurements by the way).
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