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I am interested, but have no idea how to access my ECU. I am swapping my 4.0 to a 4.6 so I am definitely interested in ECU remapping for the change.

Side question. Can I just purchased a used 4.6L ECU and swap it in my 4.0l ? Are the plugs the same? and would the vin # change? I am not sure if the vin # is tied to the ECU, just don't want to fail smog when the vin # doesn't match the car when the OBD II is plugged in displaying another vehicle.
 
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