3 Hole Bolt 3zz 4zz Intake Manifold Compatible with Toyota Corolla Runx 1.4/1.6

What does an intake manifold do?
What is an Intake Manifold Gasket | Fel-Pro Gaskets
Featuring a series of tubes, the intake manifold ensures that the air coming into the engine is evenly distributed to all the cylinders. This air is used during the first stroke of the combustion process. The intake manifold also helps cool down the cylinders to prevent the engine from overheating.

What happens when intake manifold is bad?
Symptoms of Bad or Failing Intake Manifold Gaskets …