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Originally Posted by mhainen
I just installed a K & N in my 06' X3 using stock air box. I have K & N CAI on my 97 M3 and really like the slight change in power delivery + MPG. Has anybody used K & N on their X3? If so did you see any improvement in power or MPG?
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I HAVE USED IT IN PREVIOUS CARS, IT DOES SOMETHING FOR SURE. I PLANNING TO INSTALL IT SOON.
WHICH IS THE COST IN UNITED STATES ???