Dinan plates & M3 LCA's netted me -1.8 degrees. Switched to Ground Control "street" adjustable plates and am now at -2.7 degrees. I think the additional negative camber really helps with turn in, but I have a bunch of other mods besides. And I wouldn't necessarily spend the time/money unless you have plans to track or AX the car.
NVH isn't really an issue with the GC street plates, as they're designed for dual-duty cars.
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