I didn't do a CAI, although I was gonna, but I did my short ram intake as soon as I got the car, I couldn't stand it going ALL the way over the radiator shroud and heating up and being all... stock
The pics for how I did it can be seen at:
http://photos.yahoo.com/ivandabrain2000 , under "Home Made Intake"
Total Cost was $30, including ebay filter, some piping (2.5 inch), and JB weld and paint. Work: 2 hours, and paint drying time.
Battery relocation costs and time are separate but not hard at all, another 1.5 hours of work (pulling cable through car), driling some holes for tie downs in the trunk, and the costs of the aluminum bars at Home Depot, threaded 3/8" rods, and 4GA cables/connectors are another 30-40 bucks. But this is a mod that most people do separatly from intakes. So it probably shouldn't be added to the cost of this mod.
(I also relocated my battery to the trunk, and for a CAI I'd relocate my windshield washer tank to the drivers side of the bay, it's just rescrewing it back there and the line for the sprayers just goes on the opposite site, 10 mins of work)
If anyone would want to make this but CAI, it would take another 20 bucks for bends and rubber connectors and the abovementioned WW fluid tank relocation.
sil80