The conversation between human and AI assistant.
Which air filter is best: k&n or BMC?
I'm mostly interested in the filtration quality and how long the filter will last.
There are several factors that determine the filtration quality of an air filter, such as filter material, construction, and design. K&N air filters use a cotton gauze filter material that offers excellent filtration and airflow, while BMC air filters use multi-layered cotton fabric that offers high filtration efficiency. In terms of longevity, K&N offers a million-mile limited warranty on their filters, while BMC offers a lifetime warranty.