What is VGIS Variable Intake Manifold
Variable manifold looks like one, in fact, thin tube in the thick tube. Structure is different, the same principle.
It should be VIS it, that is, when the engine is running at high speed to change the length of intake manifold
The car's engine has two most important things: 1. Low speed torque. 2. High speed power. Now do not say the other, just say the intake system.
