If its connected your relying on the air provided through the CAF ONLY.
When your in travel you dont get much heat soak anyway unless its in heavy traffic, warm day, or the cars been idling.
if you want to lose torque, keep the caf off... the thing was designed to have CAF connected. Feed it down to the wheelarch (bit of fiddling, wheel off archliner out) where you'll have a good feed of cool air
Try it with + without. Drive around a couple of days trying both situations and you'll see.
I've tried 5 different variations of airintakes, torque was best with cafs on, bigger cafs gave me the best of both, torque and top-end power.
Too much air (open airintake) was total s**t .. lost power all over.
Heat soak is also not a good thing.
Also the car is mapped for a certain amount of air and wo'nt know what to do with any more coming in..