Acoustic Control Induction System for 2011?

[T4Fun]

anyone notice this on the engines for 2011? specifically for the tundra, which has engines that are shared with 4R, the GX and LC/LX 570. what the heck is this?

 

[MrTom]

Google searched 'Toyota Acoustic Control Induction System'

Results Per Wikipedia:
"Acoustic Control Induction System, or ACIS, is an implementation of a Variable Length Intake Manifold system designed by Toyota.

Simply put, the ACIS system uses a single intake air control valve located in the intake to vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency and reduce intake roar."

Acoustic Control Induction System - Wikipedia, the free encyclopedia

 

[4ShoreRunner]

This was in the 2009 FJ engine, but omitted for the 2010 FJ / 4Runner .... maybe they are bringing it back?

 

[Snowfox]

I think this is why the 4R engine idle a little rougher than other v6 that Toyota put in other car like Camery, Venza etc.... This technology helps to increase the horse power on the motor but run a bit rough idle.