Leave the stock box on a stock sled. You end up with cooler intake temps and cooler clutches with the stock box. Under hood air, notice I didn't all it cold air, (It's 100*F, not cold air intake) consumes more air than is delivered thru the screen up front. How do I know this? Look at the CAI filter after some run time. It's full of belt dust and the clutches live life way behind and far away from the CAI filter!
I will say however the CAI does run leaner AF ratio so it is less restrictive than the stock box. The underhood intake should actually be called a WAI.