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Wheels & Tires should be fine on stock suspension providing your Boxster is 1998+ (reinforced chassis for 18+ wheels) You would need spacers in the rear, 15mm would be a good choice.
Disregard if you have 98+ Boxster
"TSB #4407, dated March 4, 1997: " Eighteen inch wheels are not approved for use on Boxsters. Use of eighteen inch wheels on Boxsters under severe conditions may result in structural failures of the body and/or suspension"
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