Sorry, no sound file. I don't have anything to record it with. The best way I could describe the sound is deep and rumbly at low rpms (>3300). Once the IMRC opens she lights a big fire under her butt and frenzies to the upper rpm range. Sound wise at upper rpms it sort of sounds like a Honda would if it had a V8. Deep tone, slight bit of rasp (until exhaust warms up), and the gurgle of the DOHC.
I took her out on an unused service highway near an old aiport by my home town. She was still accellerating hard through 160km/h until the limiter kicked in at 180. Can't wait for the Diablo...