all they are is a sportier map,some more ignition timing and adjust the afr's slightly,some with slightly raised rev limit,not the best job,as they can cause detonation as there mapped for higher octance fuel,and most of the time run your car lean,and can cause engine damage,
if fitted to your car get it checked,better off with a mapable ecu,as you can map the ecu to your car for best and safest result,




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