no -they don,t work ,on a modern car,presuming it is running ok at present -used to work on old ecus, -buts that ten years ago,std ecu corrects fuel so quick that any accel enrichment will be very qucikly tuned out by ecu- so no save your money .
a remap will not work -to do this ,and if its a 3 plug ecu ,very little if any gains will be got -on std car- remap when you have changed engine config
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