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It has to be able to adjust timing else it's not really a proper tune. You don't have much ability to maximize power and prevent knock without it. Shouldn't be any issues intercepting the injector signal to retard timing. Advancing timing, however, is a different issue. You would need a standalone ECU to be able to advance the spark signal, since the piggyback is downstream of the ECU and how to you predict what the ECU will send for ignition signals?
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