Sounds good, close to my 99' 7.3L Powerstroke; but like you said, the sound to RPM is way off. Around 3100 (My RPM limit) It'd be brutally screaming, close to what'd be 6500 or 7000 in your mod :p
Experimental 7.3L Powerstroke Sound Mod 1.1
A perfect loop of a 7.3L Powerstroke engine idle sound.