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This info may help with selecting a shorter belt:
Hello Johnny.
If you can be sure (confirm with a Porsche dealer if you'd like) that your Boxster uses the same belt as my 2007 Cayman S then yes, the Gates K060820 should work fine.
If you'd like to play it safe, take you OEM belt in to your local auto-parts store that sells Gates and tell him you need a similar belt but about 30mm to 38mm shorter. My stock 2007 Cayman S belt measures 2113mm, Gates part #K060832.
Gates offers the same belt design in neighboring lengths of 2098, 2082, 2071 and 2058 mm. The 2082 mm (31mm shorter than stock) seems to be the best length based on the calculation of the under-drive pulley circumference. For future reference this Gates belt is #K060820.
Regards,
Joe
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