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What's frustrating is that no one will tell you how the OEM versions of PSS differ from the retail version. There is anecdotal evidence that the PSS on the C7 Corvettes, for example, is a much softer and stickier tire than BMW and other users of PSS have. The C7 PSS will crack if left outside under 40F for a while. Who knows if the PS4S is better, depending on what tweaks BMW has asked for.
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