only way to change the density would be lowering temperature...
What I think when you think I care
from what I've read having a larger throttlebody it allows more air in but you have to have alot of air flowing to fill the pressure drop, its like sucking air through a straw or a 3 inch pipe you lose all air velocity
What I think when you think I care
lager TB will give you...
rougher throttle response (less linear, little pedal push = most power, and very little difference after 50% throttle)
loss of lower end torque as the air speed is slowed down
probably not much gain in the high RPM where it flows the most air.
I have faith in 90% of Toyota engineering decisions. It was probably matched to the engine for a reason.
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