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You have just answered your own question, If your going to track the car you will find exactly the characteristic's of the handling first hand so have a play and try all the settings, dont forget simple things like tyre pressures as this can also have a huge difference with handling. enjoy
I've got a UK MY05 STI with DCCD. I've also got Whiteline ARBs and BC coilovers.
To be honest, on the road it's hard to detect a huge difference when playing with the DCCD settings unless you are really behaving like a hooligan which isn't a particularly good idea.
The track is a different story. On the limit, the smallest adjustment to the centre diff can make a very tangible difference. A guy I spoke to advised me to leave the DCCD fully open for the track but I found I was just oversteering everywhere (fun, but tyres don't last long). After I got bored of peering through the side window to figure out where I was heading, and after my passenger had thrown up twice, I put it back in Auto mode. The handling was much more neutral and I was MUCH quicker than before.
My experience, therefore, is that unless you are a very gifted driver (not many of us are) the car will be a much better driver than you! In Auto mode the DCCD can make necessary adjustments incredibly quickly and deal with any under- or over-steer. DCCD is alot of fun and helps you become a better driver, but if you want to be quick, Auto all the way!
MY 2006 TSi with DCCD
Auto on public road
fully open on dry track
first orange on wet track
Car do a lot of trackdays, for the start I used auto on track, just to learn the car. After a few trackdays I only use fully open on tracks, as car is much more stable and only slightly over-steer. Much more easy to control with lift of over-steer when in open. I do not have a problem with too much over-steer as some of you mention.