I put on a bomz racing intake shortly after xmas it uses the same design as the one injen makes...i love it it sounds great no cels and the best part of it was it was only 80$......(nana)
I have been running a K&N Typhoon Intake (can be configured as CAI, SRI) I have had it for 33,000km's now (configured as SRI) and NEVER (knock on wood) had a problem with it. It sounds way meaner than a CAI and I like how you can hear it sucking in air around 3500-45000rpms. Puts a smile on my face everytime.
The cheapest K&N Typhoon I could find was ebay. It is just hard to beat ebay prices. I believe the intake + shipment to Canada cost me $260.
don't but the knock offs you will just get sound and it will kill your bottom end bad...my cars rpm band wasn't smooth it was real real rough...in a nut shell i don't think they work i took mine off and put the stock box back on and its real smooth power band is perfect i will be getting a fujita f5 soon CAI i say go with that, its pretty affordable and you gain power from it and have a growl.
my ebay CAI was the injen knock off ...i didn't feel power, i thought i lost some instead but then again it was the knock off thats why i am getting a fujita.