The current sound on the 1988 Lamborghini Countach LP5000 QV is inaccurate. It sounds muffled and flat when it should sound much more throaty and aggressive.
The videos below show the difference in sound between in-game and what the car should sound like.
Video showing the car in-game and the inaccurate sound it makes
Video showing the car in real life and the sound it should be making