Air Intake Resonator

[gnegroni]

With regards to the 2AZ-FE engine, the article linked below states:

"As in the smaller NZ engine, the new AZ adopts a plastic, built-up, and vibration-welded intake manifold integrating a large volume plenum chamber (3.5-L (214 in3) volume including a 1.3-L (79 in3) resonator)"

http://www.sae.org/automag/techbriefs_07-00/05.htm

My questions is, if it mentions only a 1.3L resonator, which I am guessing is the big white plastic one near the battery, what are the small weird looking appendages ones near the throttle body? Air reserves?

[Midias]

^ I would guess they are to change both the dB level and frequency of the intake noise. Toyota is strict about the resonance frequency of their intake and exhaust systems.

[gnegroni]

^ I would guess they are to change both the dB level and frequency of the intake noise. Toyota is strict about the resonance frequency of their intake and exhaust systems.

Good thinking...I remember when I forgot to put the long nose intake back again after cleaning noticing how loud that engine really is!