I installed a Miata battery in my 3.4 street boxster and had mixed feelings. It was much lighter but would only last a few months before going bad. As time went on it had a harder time starting the car. I eventually put a factory sized battery back in my street car. I took the battery I removed from the street car and put it in my rallycross 2.7 boxster and it works great. The rally boxster is gutted with no AC compressor. The miata battery starts it right up without any hesitation.
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Woody
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