Sorry if this question is somewhat remedial for some owners, but what exactly is a Mass Airflow Sensor. Is it the same thing as the O2 sensor? If so, must we purchase two of them when we upgrade? Second, a mechanic friend of mine said that gas mileage has a lot to do with airflow to the engine and that's why the airflow sensor would improve gas mileage. If this is true, would adding a hood scoop also have the same effect? I have both modifications in mind and could use some quality input. Lastly, regarding anti-sway bars: Calmini or Hellwig? Tight corners are not the VX's forte, and any help would be great!! Thanks ahead for anyone's know-how!