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it is not a different system.... the ignition advance is all electronic... with it is included the AFM reading, the TPS reading, the 02 reading, coolant air temp reading, air temp reading.... the ignition and fuel are intertwined to add/reduce fuel and timing together to complement one another... you can't have one w/o the other on a stock toyota system.
you could, potentially ditch the entire system then use a megasquirt & edis based system for ignition.....
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