mpg and intake

[Rkitkt]

Does any one know how the mpg is calculated in the info center. I know that there are a lot of units that use the amount of air that enters the engine to get this number and do not actually measure the amount of fuel used. If this is the case with our cars then does the intake skew the numbers since it is allowing more air into the engine. I know that the number is not totally reliable i was just kind of wondering. Also i am sure that someone can answer what it is mechanically that causes the sound of the engine to change from the intake. Which by the way does sound awsome. I installed mine last thursday finally left out of town last friday,not in my car, and then was frozen out through Wed. So just got back to driving yesterday. Thanks guys

[08altima35]

the change in sound is due to the increased volume of air passing thru you motor and out your exhuast.well, that and the 80hp gain to the wheel.