Which car is such? For me I think many are quite well balanced, but there is always room for improvement as perfect is pretty impossible to make. Things I think being different from IRL currently are: Wind / road noise drowns engine at steady 80kph IRL, engine braking at higher rpm surely does make noise, but also throttle pedal position should affect engine braking volume IRL, then scale which engine gets louder at high rpm is a lot, while in game it is quite mild change from 0 throttle to full throttle or from idle to full scream. Wind noise alone is very loud at higher speeds, especially with older vehicles at 150kph wind noise can be so much that you can hear just a little of engine. Also exhaust can be softer at idle and raspier at higher rpm and load, in game idle can be quite strong with some vehicles. Main thing what I miss though is how thorttle position is not affecting much of volume, which makes for example throttle blip with Sunburst to sound much less than what one excepts. As throttle butterflies close they kill lot of sound, so when blipping there is quick increase of sound volume and tone too which is what I think could be what you are also missing.