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      06-02-2011, 10:34 AM   #15
dogears
My master volume goes to 11
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Err... Yeah. I posted that. I was proving Trackrat is wrong and that there may actually be measureable gains by changing to the less restrictive EU filter. Otherwise it would be cheaper for BMW to have one part. Clearly the EU filter is the higher flow and speced part. The US version is an emissions requirement that is a detriment to flow.

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Originally Posted by FStop7 View Post
Because of an emissions rule in the US that does not exist in Europe.
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