I have an 01 x sport (i think they have similar enginees insde)... and isntalled a kkm http://www.kustomz.com/cat2.html ...
some people like it some don't even consider it to be an intake just because it doesn't have a pipe....
My personal experience: I have not seen dramatic hp increase, or mpg gain (i just installed it last weekend)... one thing i tell you is that the truck seems to move easier (gets to 80mph easier than before) and way better throtle response... (you actually can hear the thing sucking air even when you are inside seating in the driver's seat, but nogthing that will drive you nuts)...
to me all of them do the same ... unless the pipe really makes a difference you really could go with a round filter/adapter -e.g., kkm- and get the same results...
it is not clear to me if the intake pipe will work better than stock intake... may be we can get somebody to dyno-test several intakes and see what works best.
for that matter you can spend $37.00 and get this http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=7985629713&category=38634&rd=1
somebody please correct me if i'm wrong ....
for that money it might worth a try...