On Ebay there is a cold air intake system for the GXP. Looks like you ditch the stock top filter cover (not sure what you do with the hose that is connected to the lid?) and install a couple couplings to the throttle body than it has a cone style K&N filter that sits in the filter box. Has anyone tried this or recommend it?
I currently have a K&N filter in place of the stock filter, not sure I would gain much more going this route (probably just more intake sound)?
Are there any other air intake systems available for the North*?

you have a link to check it out?

You wont gain any performance. Just keep a good clean filter and you will be fine. The difference with the K&N is you can clean it instead of replacing it.

Here is the link:

http://cgi.ebay.com/ebaymotors/04-20...Q5fAccessories

That'* looks more like a warm air intake that would suck the warm air out of the engine compartment. You would be better off sticking with the factory intake.

There is major clamp-age going on there never mind the reducers. I would recommend leaving it alone unless you can mount this http://www.knfilters.com/search/prod...x?Prod=RU-3040 under the front bumper and route it to the intake

Warm air intake for sure.

I bet it would sound nice, but it does nothing for power. Nothing good, anyway!

If you really want to do something with your intake, I suggest going to ZZ performance or Intense racing and pick up some of their hose, it'* about $10 to $15 a foot depending on the size you get. Pick up 2 or 3 feet and then get a K&N filter and run the hose to your fender well. All done.