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If you're thinking of an Optima battery you want the Optima 34R since this reverses the battery plus and minus posts allowing it to easily connect with the Boxster setup. However, the Optima battery not as wide as the standard Porsche battery and you will have to either make or purchase an adaptor plate allowing the Optima to be secured by the mounting bolt located in the bottom of the battery tray. Great batteries though.
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