[Domman56]

Originally Posted by Daox

MetroMPG tested high flow air filters long ago and proved that they do not improve mileage.

Testing a 'performance' air filter for MPG - Part 1 - MetroMPG.com

Testing a 'performance' air filter for MPG - Part 2 - MetroMPG.com


Tweaking the exhaust can likely lead to small increases in mileage. However, you'll likely want to go smaller than OEM pipe size to do this and that may reduce peak horsepower.

all cars and all drivers are differen't

besides air intakes and air filters are different when you change out the air intake setup it'll effect it one way or another