I have one on my 08 FX-4. It added a bunch of air flow. I put it on a couple of weeks before I put on my Roush OR exhaust. You can hear a different tone in the engine for sure. I am waiting on my VMP Custom Tunes now, should have them next week!
You need to do a search on the subject of 2004's running lean. I would not put an aftermarket intake on a 2004 or early 2005 without a custom tune. Many came from the factory in a near lean condition and with the added air, you may do some damage.
I wonder who makes that for Roush. Is that the same as an Airaid?
Yes blue you are correct. Airaid makes the intake and all they do is give it swap out the words airaid with roush. Even the filter end cap has been changed over to the words roush. At the time Woodhouse had the best deal on these. Not sure now though
ok, so im reading along with what everyone is saying, and i saw that Bluejay said that installing a Roush/AirRaid CAI can cause harm to the engine? is there anymore insight on this? what can be done to correct it before installing a CAI?