You may have seen a BMW or a Honda once that had weird little tube things sprouting from one side of its engine. What’s up with that? you wondered, right before the owner gave the car a rev and your eardrums were split in half.
That was the joy of individual throttle bodies.
I did an explainer on how these work to get more air more into your engine more cleanly (but also more complicatedly and expensively) not that long ago in a piece I did on velocity stacks: