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Since the advent of Electronic Engine Controlers
back in the 80's it has bee n possible to change the parameters and change to characteristics of the fuel/air and timing.
By changing these parameters (The Maps) it's possible to increase the BHP and torque output.
OBD2 came along at the end of the 90's and allowed communication to the ecu via a diagnostic plug within the vehicle. With moder tuning interfaces we can remap your vehicle from inside.
Chipping is the term used when the eprom chip inside the ECU is replaced or reprogrammed from the PCB of the ECU
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