IMHO sounds on all vehicles are enhanced since the update. They are much louder to the point where engine noise from other cars (Blitz!) will drown mine out when I drive from the bumper cam. It can be addressed somewhat by adjusting sound output.
I think it is more realistic, when parked under the bridge a Suzuka in online races, the sound of the cars going overhead is freaking awesome. I swear I hear dirt and derbris hitting the car as well. I use a nice pair of 5.1 headphones, BTW.
Overall, I think you will be happier with the sounds.