im pretty sure the stock intercooler inlet and outlet are different sizes so thats why you need those two. otherwise it would be for intake stuff on your CAI which is 2.75" tubing without counting the space of the coupler so 3'' might work.
Thanks Wisnia Place, Anyone who BOOsts will have learned that t clamps and hardpiping is the answer. You wisdom and accuracy are appreciated. my stock hot side did not work out for me. grabbed some SUs for now. a little pricey but much, much better than stock. and at my low boost I have no worries. yet.