i do not think the CAI are worth the money. in reality, your really going to see maybe 3hp to the wheels. they always claim 6-7hp to the wheels but this is done on a dyno with absolutely perfect conditions. for 200+ dollars, I can think of alot more things to do to my truck than a cold air intake. For the scion, TRD makes a drop in filter replacement that increases the horse power almost equal to the CAI and its only 50 bucks. Now, you dont get the cool looking pipe under your hood, but the performance and longevity is there. In my opinion, the CAI is mainly for looks and people who enter car shows and show off thier engine. Its more of a cosmetic thing than a performance for the price you are paying.
