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Re:Fewer than 3% of cars sold in the U.S. have manual transm... by CoffeeDregs on Thursday November 17, 2016 @11:40AM (#12978937)
I think you're referring to "Jake Braking", which is very noisy and is banned in many towns (in California).

https://en.wikipedia.org/wiki/Compression_release_engine_bra...

Re:Fewer than 3% of cars sold in the U.S. have manual transm... by Unklejoe on Thursday November 17, 2016 @01:07PM (#12979801)
"Jake Braking" is similar, but pertains more to diesel engines which have a special valve to support this since they work differently.

Engine braking on a gasoline engine is actually quieter than normal operation.

Re:Fewer than 3% of cars sold in the U.S. have manual transm... by mmagin on Thursday November 17, 2016 @01:56PM (#12980265)
At least the manufacturers of those products assert that correctly installed ones are no louder than the diesel engine in normal operation.

http://www.jacobsvehiclesystems.com/about-us/environmental-h...