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      11-15-2005, 06:07 PM   #7
epiphone3
Lieutenant Colonel
27

 
Drives: 2013 BMW X3 35i
Join Date: Oct 2005
Location: Calgary


Posts: 1,647
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The only real difference it will make is allow more filth to get into your engine. I saw a study on this once and the K&N filters better than a BMW filter for the first few hundred kilometers and then filters worse for the rest of its life.

Think about it... especially the 330i guys... you already have a 3-stage intake manifold, do you think your engine will run out of air at the high end??

The only guys who might see a little high-rpm advantage is guys with the "detuned" 325i and 323i powerplants. Even then, what, like half a horse power?