I am still a fan of the lightweight lithium battery. Same CCA or better than a stock battery but a lot less reserve power. 5lbs instead of 50lbs. If you drive your car once a week and don't have some massive sound system in there, a lithium might be right for you.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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