This is a youtube clip that exist in many different versions but I feel this have the best sound of them all. It have orgazms in a bundle. Listen to the whole clip and feel your arm hair rase up as the car passes the microphone... V6's, V8's, V10's and even the V12 comes to shame when you hear this, or better yet go to 5:40 in the Video for the on board sound clip ... HOLY MOLY
R3E has the best sound engine on the entire sim racing market, but there is one thing which I really still miss: The deep crawling sound effects / basslines ... the Mustang GT3 is already very close to that ... I hope we hear exactly something like this in R3E one day: