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Air filter
Just wanted to let those people out there who have the 128i know, if you are looking for a easy cheap, and quick performance upgrade, I definetly recomend putting in a k&n filter. I just put mine in two days ago. It is only 47$. You don't feel a big difference, but you definetly do feel a difference, car is a little more responsive, and the gas milage is better.
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