thinkning of getting xede this month, who all already has it?

this is more correct. sensors feed signals to the XEDE which then sends altered signals to the ECU.

i thought the piggy back intercepted signals from ecu and changed them...wouldnt what you jsut stated be detected? since the ecu recieves signals from the piggy back...it would record the "altered" signals
 
I think it does both.

It must change the inputs to the ECU. It must also make changes to signals coming from the ECU.
 
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