Removing the "secondary filter" aka charcoal filter from the airbox.

i cant imagine my dumb, white trash ass is anywhere near as smart as a Japanese engineer concerning much of anything muchless the vehicle he designed.

 

Seemed like a good idea as it would be less restriction. More info on them, now that we have been living with the filter for this long.

 

Making something that goes boom is one thing, but figuring out a Toyota engine can be something else.

 

pulled mine out in pieces, made quite the mess with the little charcoal BB's throughout the filter. Noticed no difference in sound/performance on my 2.7. Better with the thing gone though imo.

 

I would figure, like others have said, its an emission thing.

 

The Carbon Filter is for absorbing any fuel vapors when the engine is off.