My dual-sport (street/track) 987 has lowering springs and GT3 arms to get -2.5F -2.0R. I run street tires and this seems to work pretty well with even tire wear, good turn-in and balance.
If I were running a softer compound tire I would want more neg. camber.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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