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Exactly.
If you have classes based on Power to Weight, you have a top class, where it's "greater than Xbhp/tonne" that doesn't make a car that just falls into the class competitive with a car that has over 1000bhp and weighs 1400Kg, which would be easy with a twin turbo Chevy in a V8 Star. Or blowing a Dodge Viper......
By restricting the air that they can breathe, you can set a maximum. In some ways, it helps making the more powerful cars more reliable and un-stressed.
For cars with carbs, it's a simple restrictor plate between the carb and the intake manifold. Just bolt it in. If the carb is calibrated correctly beforehand, no adjustments are required. It's just like putting a brick under the throttle!
The argument against is that the injected/managed engine will need to be re-mapped to work with the restrictor - unless the engine produces less power than the restrictor is designed to allow.
You can never please all of the people all of the time!
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