yes when installing lets say a intake,..its advise to reset the ECU,..one method of resetting the ECU is pulling the negative side on the battery,...pull it off and let sit for 10 mins or so,...put it back on,..then turn your car on,..DO NOT TOUCH THE GAS PEDAL,....just let it idle itself for another 15 mins,...after 15 mins,...turn the car off,..then turn the car back on,. your ECU should be reset