Restrictor plates

Can someoneplease explain restrictor plates and whether they should be upgrades or not?

To put it simply, think that your intake is a simple pipe which has diameter of 5cm. that is “No restrictor plate” Now adding restrictorplate in that intake you put one plate inside that pipe and reduce the diameter of the pipe, to 3.5cm.

That restricts the airflow to the engine and therefore reduces power.

In forza you can remove these restrictor plates, and therefore you gain more power.

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