It stands for Mass Air flow Sensor it should be located right behind your air box. (I Think) at least that is where it is on most cars. Its a tube piece of metal that runs in between your air box and your throttle body. Your car should have one but you wont gain anything by flipping it. What it does is reads the airflow that’s coming in so it uses the right amount of fuel/oil mixture (I think again) Hope that helps.
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