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Electronics enhancements are quite subjective. Usually those power hungry guys like to fit in larger injectors which to their calculation will increase the engine's power output. However those non electronics knowledge installer just suggest and install those bigger injectors without calibrating the impedance impose by the injector and miscalculate the burden that have to be taken by the injector drivers inside the ecu. Eventually, the drivers collapsed and burn. So are the changes of ignition coils. Some may use the Coil on plug configuration without knowing the difference in dwell could caused overloading of the ignition drivers inside the ecu. Some use that outstanding branded coils etc. which said able to deliver fatter spark.
Your friend's ecu may have faced those problems or it may be caused by it's aging factor where the power caps get leak and burn the ecu board.
As I said, E-Manage is a sophisticated piggyback. If abused or misconfigured, it may retaliate.
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