But there once was a time where old school tuning went a long way, and this video of Youtuber Garage 4AGE testing several intake runners proves how big a difference small parts can make.

The air coming into a carb and intake manifold is not just on a one-way trip ... How did Toyota do it times four on the 4AGE (an older inline-four Toyota engine -ed.)? And I'll do that, times ...