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There was a test of BMW K motorcycles measuring airflow past filter. Compared were
Stock filter
Stock filter 1/2 blocked off
No filter
K&N
There was no measured significant difference in airflow.
Waste of money, and if you need one that's rectangular as opposed to circular, a poor quality product.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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