I'd go with the 220, or the one with the best warranty. Then have a disable switch. The higher amp alternator should recharge quicker than the measly stock 96 amp. I think Balto has mentioned that a bigger alternator is better for mpgs due to it having to "work" less to charge.
I would see how much of a gap you can go before there is misfires. I have 0.070" gap on my ZX2, stock is 0.048". I do know that with a Coil-On-Plug conversionm I could run 0.15" if I wanted. You may be surprised what the stock coil is capable of.
Also, I think Daox tried the Dc-to-DC converter thingy recently, and it failed.
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