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DC-DC is the only way to do an alternator delete right. Your electrical system really needs ~14v to do its thing. I once read that a race team measured a 10hp drop for each volt below 14.5v. If I simply disconnect the alt in my camry it only takes a minute before the battery voltage is ~11v with a load on it. It still runs fine, but the spark isn't as hot, lights are dim, fans run slower, etc.
I've found a dc-dc on ebay that takes 24v and outputs 13.8v @ 60 amps cheap ....should be perfect for an alt delete. Combined with a small AGM for cranking and to handle peak loads like a radiator fan kicking in and you'll be at least 10% better. On my camry its more like 20%, which is pretty phenomenal.
Instead of removing the alt you just de-energize the field. Its easy to do....and if you ever drain the batteries or have some problem you can always just re-activate the alt in a second.
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