When West Coast Tuning remaps your ECU or in other terms tunes your car’s chip, we are modifying your car’s controller by adding a map that controls the running of your engine.  ECU remapping or Chip Tuning are both terms that refers to the same thing, modifying the data within the ECU (Engine Control Unit) to gain better performance or more economic performance or even remove an aspect of the engine that is causing issues (EGR / DPF).