What is "bottle" beneath intake duct on passenger side?

SouthArk370Z

Edit: Oops. Bottle is on driver's side. No corresponding part on the passenger side.

I've been preparing to insulate my intake ducts and filter boxes and have found a part that I can't identify. There is a small black plastic, odd-shaped "bottle" hanging underneath the intake duct near the throttle body. Clamped to a port molded in the duct. Only port in the bottle goes to the duct - no other inlet/outlet.


I can't find anything in the FSMs. EM-27 shows the filter boxes and ducts, but not the bottle. EM-27 also shows resonators on the filter boxes, which are not on my '09 Touring and not on the spares I bought, so maybe Nissan moved the resonator.

Two numbers on the bottle. "JK20D" is molded into the plastic and "80923" is in white paint nearby. A search for "Nissan JK20D" only found some kind of pulley. "Nissan 80923" finds Nissan dealers in Colorado.

Anybody know what this part is/does?

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