My Boxster came with Continentals and Michelins are also std from the factory. I could be wrong but I don't think US Boxsters come with Yokohamas.
Have you checked tirerack.com? They have reviews on tons of tires and you can compare it to competitor's tires.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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