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      03-11-2013, 11:09 AM   #16
Andy_H_E92_M3
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Drives: 2008 E92 ///M3
Join Date: Dec 2011
Location: NC

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I'm also waiting to scrub off my tires before replacing them with a matching set on all four corners, but FWIW, I've run mismatched F/R street tires at my six most recent track schools, and the M3 handled great. Would it have handled even better with matching F/R tires? Maybe, I can't say for sure. But to the OP's original question, I don't think there's necessarily any harm in running PS2/PSS. It's not like running winter tires in the front and r-compounds in the back.