Okay, first off, WELCOME TO NECO! We're always glad to have new members aboard! As for your question, you can use the Weapon-R cold air box in CONJUNCTION with your Injen intake. The Injen (K&N) filter fits INSIDE the Weapon-R box just fine. It will require a little bit of modification to the box itself to use the two products together, but it is not very difficult to accomplish. I can tell you this in good faith, because I HAVE the two products in my car now. (I'll attach a pic of my engine compartment.) If you need further information on how to install the Weapon-R cold air box with YOUR Injen intake, feel free to ask!
Again, Welcome!
Charles
BTW...There are no other companies currently producing a cold air box (or ram air kit) for the Cougar.