Legal Implications
Compression brakes, a form of engine brakes, produce excess amounts of noise pollution in comparison to exhaust brakes. For this reason, some vehicle original equipment manufacturers prefer to use exhaust brakes, even when the performance is not as good, due to the noise issues. However, combining exhaust brakes and compression braking increases their effectiveness while significantly cutting back on noise pollution.
Numerous cities, municipalities, states, and provinces ban the use of unmuffled compression brakes.
Read more about this topic: Exhaust Brake
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