I wouldn't mix on an M3 personally BUT anyway I suggest putting on 4 x 5P's despite the somewhat wasteful nature of ditching two good tyres.
5P's are a literally a car changing tyre giving so much grip and feedback that you will almost be annoyed that they don't come as standard / that you never fitted them before. Turn in, particularly given that your two fronts would need to be "unnecessarily" replaced is transformed.
They are that good.
Ken
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