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Hi all. I have a 2003 Boxster with 16" wheels (why would you? ) and I want to go to 17" wheels. Will this effect the speedo reading and if so can it be re programmed Present tyres 205/55 - 16 front and 225/50 - 16 rear. Want to fit 205/50 - 17 front and 255/40 - 17 rear. Thanks Dave
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