"Deep" is a very subjective term for the 4.0 SOHC. "Loud" is also, but never heard the combination of both. Regarding those who say
"it sounds like a V8", I've never heard ANY V6 ST sound remotely close to a V8 regardless of displacement. It's all about harmonics. This engine can actually sound good up until about 3000 RPM's, then it tends to get raspy, almost "ricey" sounding. Unfortunately, listening to YouTube exhaust videos makes it extremely difficult to tell, much less hearing the exact setup you would be using. After physically installing several mufflers on my Trac including Magnaflow, Flowmaster, and Borla, I ultimately ended up with the Dynomax Superturbo removing the factory resonator. It had the deepest note, but was also the quietest of the four, almost stock sound at idle.