The other reason for better emissions however, is that a later intake means that the exhaust doesn't escape as well so it can be Toyota's way of not having an EGR system. The inert gases reduce combustion temperatures, decrease NOx, if this the example engine even is capable of making NOx, I'd be surprised, but these are the normal functions of EGR. On bigger, badder engines, without EGR, you'll pit your pistons, so let's not just hate the fact that they can clog up or make our intakes dirty. They have a valuable purpose for engine longevity as well!
And now to the YouTube segment today of our article!
See a VVT-i engine versus the same one without!
By AutoBravado, also DE Nichols on YouTube.