Negative Positive
Title: Great filters, especially for racing.
Review: The K&N filters are excellent for racing purposes for two reasons. First, is the nut formed on the end which allows you to use a common socket to remove and install the filter. On many bikes, getting to the filter with a filter wrench can be a pain due to tight clearances. Second, the nut is drilled for safety wire. Racing requires your oil filter (among other things) to be safety wired. The is easily and readily accomplished with the provided drilled nut on the K&N filter.
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