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http://www.tirerack.com/tires/tires.jsp?tireMake=Continental&tireModel=ExtremeContact+DWS&frontTire=05WR7ECDWSXL&rearTire=54WR7ECDWS&vehicleSearch=true&fromCompare1=yes&autoMake=Porsche&autoYear=2003&autoModel=Boxster+S&autoModClar=&fromTDGResults=true&autoMake=Porsche&autoYear=2003&autoModel=Boxster+S&autoModClar=

I'd look hard at these. Good grip and road manners, good in low temps. Last long time.