It would be very easy to tune an exhaust to pass that test.
As all Morgan owners know there are certain revs that boom through the exhaust.
On my last 4/4 1600 the engine had a 1/2 race cam and with the 40DCOE's it sounded as if it was constantly doing hillclimbs.
When I changed to a Kent HI-Torque cam the difference in sound was remarkable. Timing of the camshaft makes a huge difference.
