E-manage is a piggyback.
Greddy has alot of hype in it. If you want a proper standalone, its Haltech, Hestec, Tatech, KMS, etc even megasquirt is better than a piggyback, because piggybacks have alot of limitations.
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most tuners will not go over 25* when tuning.
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Even alot of turbocharged cars run more than 25degrees. 20 degrees is pretty much safe.
I'll be running 20 degrees with 95 octane (low octane) pump gas. I sure as hell havent done anything to the chambers and I sure as hell wont bust my engine with knock.