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What you want to try and find is the reserve rating for the battery.
If this battery is the same one that is sold at autozone (just under a different label), then it is somewhere around 150. If you divide 150 by 2, and add 16 (a formula I found on e90post for converting reserve minutes to amp-hours), then you are left with 91Ah, which is closest to what your car is already coded to.
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