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It looks like Group 27 is your factory battery size. It's the only one that doesn't have a disclaimer that you might need to remove the heat shield to get it to fit. Get it with the highest CCA you can find. Autozone lists one at the bottom of their list with 630 CCA.
 
Even among same group size get the highest cold crank amp battery you can. They do vary widely.
Also I put the biggest physical size battery in the tray that I can regardless of "what it calls for". At group 27 that's a pretty big one, and about as big as you can go. But they're getting hard to find.
At least around here. I think a group 65 is a little bigger length and width, bit a little shorter. I've used them but had to modify the hold down slightly for the extra width
 
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