no most engines use mass air flow sensors. i just dont think honda uses them. i know my chevy does, so did my nissan. so do most fords. they measure the amount of air being pushed through them and make small adjustments accordingly to the amount of fuel being dumped into the motor. theyre kind of a pain in the ass because they can cause some weird conditions when you modify the car. theyre kind of restrictive, but if you port them your a/f goes all to hell (sometimes) and its harder to tune.