Diffs on a 4wd car are very important tuning aids which most people tend to overlook.
I ran an TRF501 in 2008 and on that car, I set the front diff very loose (but not slipping) to increase turn in. That's also the reason I used the front oneway diff a lot in the TRF.
In 2009, I switched to a CAT SX and that car really demands a rather firm front diff to increase traction exiting corners and use it to stabilize the rear end on corner exit. The CAT SX has so much inherent turn in, It doesn't really need a loose front diff to get enough turn in.
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