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I've wondered much the same things you have. Mainly about the exhaust (considered headers, low restriction cat, free flow exhaust for my metro) I'll be watching this thread with interest. After reading about reducing intake resistance on my Subaru I did a Resonator delete. Admittedly this was done for power purposes.
Just my .02 bits. my understanding is that EoC (Engine off Coasting) isn't terrible for the battery (Though I can't imagine it helps the battery). Rather, Alternator kills or deletes which prevent the Alternator from keeping the battery topped up and completely drain the battery, lead to their rapid demise.
While I have spent most of my life as a gear head, I'm a Ecomodding newbie and most definitely not an engineer so I could be wrong on the above. Just tossing in my thoughts/understanding.
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