Quote Originally Posted by stephen8512
sorry to ask a noob question but wats a BMC filter?
and does the INJEN CAI come with the K&N filter?
:S
The BMC filter is a twin cone filter. So if you're familiar with a single conical filter such as the K&N it has an end cap. The BMC has a ring instead of this cap and has an inverted conical filter surface that goes inside the filter. http://www.bmcairfilters.com/

In theroy it yeilds greater gains due to an increased ability for the engine to induct air.

Yes, the Injen intake comes with a filter that is identical to the K&N filter. The only difference is there's a black plastic cover on the end embossed with the Injen logo.