carbon canister related i reckon. if you dont have the carbon canister, just remove them and block the pipes off.
Just make sure you block the pipes up at the intake manifold side otherwise your idle will be affected.
There are reasons not to remove the charcoal canister but no-one has managed to blow themselves up as of yet lol.
I've never known any going bang, not even on other Toyota models when removed. It's there to do something but if taken off won't destroy the car......as we know anyway