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Originally Posted by AtomicLabMonkey
No it won't - what he was describing is no different than typical tuning with tire pressure at an auto-x. Higher pressure in the front, lower in the rear, so the fronts grip more and the rears roll over and grip less.
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Yes it will-
possibly. Mismatching tires is likely to create a larger rolling diameter discrepancy, which WILL burn out the center diff relatively quickly. Also, the large difference in friction would create a lot more wheelspin in the rear than in the front, which is even worse.
I would highly advise against not keeping all 4 tires as close to identical as possible on a Subaru. There are other ways to take out understeer, but mostly you just have to drive it out. It is possible to tune some power oversteer in (Dean's car for example) but it will never be all that tail happy. You just have to not overwork the front tires, that's all there is to it.