Sound is great, engine is great. Just one comment: When you leave "Clutch assistant" on, the car tends to ride the clutch all the way through first gear. If you hit the throttle too hard, the car stops going in the direction you intend it to go. When you add traction control and an automatic gearbox (which has a torque converter, reducing wheelspin), the car finally becomes drivable.
It sounds good and the idle is AWESOME! But I can tell that like you said it is a rally V6 with a higher pitch, and there is no difference under load or not. But regardless it's still kinda sounds like a rotary and I do like it :D