+2 on the Yellow Top. I had a Yukon with the touchscreen Nav, DVD, PS2, Four Monitors, Two JL Amps. My battery was always low and dead. Switched to the yellow top and never had any issues.
Mine sat like your Boxster, it would still be dead in the winter if I did not crank it for two or three weeks. After about 15 minutes on a trickle charger and it was cranking the Yukon.
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