In my misspent youth the more noise an engine produced was in direct relationship to the perceived horse power. In fact this is not true.
As I progressed from the kid thinking to a more adult mind set I found that I did not need being chased down by cops for excessive noise. In 1955 I removed my Douglas steel packs in favor of stock chambered mufflers with 2" pipes from the stock cast iron manifolds to the rear bumper, the silence was golden.
The other tenants in the complex I lived in no longer complained about the noise when I came home late at night from a night of cruising and/or street racing.
As a point of info the engine in my '36 Ford is a well built 59AB, bored .60, Weber F1 cam, 1/4" stroke, Offy Super intake w/97's, heads modified to 9.1 compression, H.C. ignition and a 15# flywheel. In my street racing days the car was very seldom beat.