Tailpipes from the muffler exit out to the open end that measure 55 to 70 inches length on V8s tend to have an annoying drone somewhere at an RPM and throttle opening typical of highway cruise.

The stub pipe does not have to straight.
Think of all the curves in headers.
The science phenomenon that causes drone is the same one that gives added engine power with headers.

Last edited by 360view; 12/28/17 11:27 AM.