I believe I know what you are refering to. It is on the V6 also. But it has a molded clip that connects to the intake manifold. All it is, is a silencer. Just to quiet the intake flow a bit. Most auto manufactures have something of this sort. Some people say it is to "curb" the turbulance in the system( like what a BOV, CBV, ect. does when the throttle blades close) so the MAF does "reread the air"....the reason it is AFTER the MAF(to "catch" teh already metered air so to speak). But I have NEVER had any ill-effects for removing it on even a stock intake. Let alone completely removing it with a CAI.
Sorry it is a long winded reply. I just cannot find the right words righ tnow.