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The only thing that a "jake brake" and an exhaust brake have in common is that both will slow the vehicle down. A "jake brake" is a compression brake that is installed in the heads of a diesel engine. Therefore, it is called and engine brake. Engine brakes are outlawed in many mountain communities due to the excessive noise produced when engaged.
The exhaust brake is very quiet when engaged and is not outlawed in any community and can be used very effectively for retarding momentum.note: opinions vary on this subject, so do your research.