Hello:
I was looking at the K&N website and I found the following partnumber: 63-1032
It's for their Aircharger system, it replaces the Airbox system in the Xterra/Frontier.
It's not just one of those cone shape filters that attach to the stock Airbox "Hose".
http://www.knfilters.com/aircharger/aircharger.htm
Following the links in their website, it seems to be around $225.00.
Is anyone using this system? How good is it?
Thanks for your help guys!
Cedrec