Don't listen to the vendors
I bought an Injen from them and I sold it off, piece of glorified garbage. I track this car often, and it was causing all sorts of shifting/hesitation issues on/off the throttle. I switched to a Dinan for a few months, and 4 track days, and i had 0 issues. Now I'm back to stock with a K&N filter, as the Dinan sound is underwhelming after the cold air.
I got CEL's only a week after install, mass air flow too high blah blah. If you push this car and drive it hard, you will get hesitation/transmission shifting issues with the cold air intakes (assuming automatic 8spd dct).
The only solution for these problems is to unplug your MAF, and then your stuck with a another code
My advice is to step up to a better closed air box (Dinan, AFE, etc), but it will definetly not sound as cool as the Injen (I give it that).
Look in the for sale section of the forum, most members don't bitch, they just sell it off to another member.
-Paul