im not entirely sure why that chamber thing is there either...
but i know that all the snorkel pipes connected to it, are intake pipes, the one behind the foglight and the one next to the battery, are all taking air in ;)
these pipes probably could be repositioned better i guess
From what i've seen in my Camry. The Snorkel intake goes in > splits into two > the top opens at high RPMs by ACIS or some vacuum thing > the bottom goes to a vacuum box or this white box > filter > into TB. It only takes in air from one place which is the snorkel.