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Using reputable test equipment and methods, a test of a BMW k-bike was performed
The test compared
Stock filter
Stock filter half blocked off
No filter in airbox
K&N filter installed
NO difference in airflow was measured among the 4 configurations.
Given this along with the experience of many that K&N has trouble providing rectangular filters in correct dimensions and that the filters themselves are known to deteriorate/collapse, they are simply items for fools. Indeed enjoy the noise
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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