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Only reason I made a tray for mine was because I wanted to make sure it was more secure and that it would also help with airflow over rad. Plus I can always replce to stock without any permanent mods.
Went with this battery per research, cost, and your suggestions. $40 shipped I mean c'mon. I only drive my RX-8 spring summer and early fall so, we'll see how it holds up with a little daily driving....