This is a link to Team Sol's website. They have a how-to on making your own CAI, close to AEM quality (tuned)
http://www.teamdelsol.com/howto/coldair/diycoldair.htm
I link the idea, and my do it for my g/fs del sol. I imagine the same concept could apply to any vehicle, you just have to know where the bends need to be.
(BTW: I checked JCW for the mandrel bent tubing, and yes they still sell it, but its a little pricier than what the guy who wrote the how-to said. Its still better than laying down 200+ for the AEM name.)