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      09-18-2012, 04:16 AM   #11
Pierre Louis
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Drives: 2016 535d
Join Date: Apr 2012
Location: Savannah GA/Orange Park FL

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Quote:
Originally Posted by NRG View Post
I've read that before, I'm aware. But the fact that my truck runs higher then stock boost settings with remap I'm aware as well. X5D stock filter is double layered paper+cotton ( sort of) I've tried blowing air through it with air gun vs K&N and results were obvious, K&N allows noticeably more air through. I'm not saying it's the best drop in out there simply flows better then stock X5Ds.
No doubt. Just doesn't filter...

I have the same debate with the AC guy about pollen filters.

Engineering is all about compromise, but the data shows there is little compromise in stock filters and the extra flow is unnecessary.

PL