Sorry it took so long..and I may not know what his problem is, but, whan you change the ecu you also change the the fuel cut-off which can allow your engine to rev higher than it was intended to. If you balance and blueprint your engine, and upgrade your valve-train, it wouldn't be too big of a deal. If not you'll no doubt dramatically shorten your engine life, if not bend some valves or worse. Anyways air-fuel mixture will still probably be off since it wasn't designed to work with that engine.
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