Strykar

Agreed.  Perceived sound outside the car, a lot comes from the tires against the road.  Inside the car may be more from the wind depending on vehicle and speed.  Different tire treads can impact tire/road noise as well.  Anywho, those are the two biggest noise makers, I think.
 
Overall, my point being, engine, exhaust, and/or transmission noise is too loud in many games for stock vehicles.

Agreed.  Perceived sound outside the car, a lot comes from the tires against the road.  Inside the car may be more from the wind depending on vehicle and speed.  Different tire treads can impact tire/road noise as well.  Anywho, those are the two biggest noise makers, I think.
 
Overall, my point being, engine, exhaust, and/or transmission noise is too loud in many games for stock vehicles.

Why do games make cars so loud and obnoxious?  In reality, they're not that loud. Unless they're modified, cars are required to be quiet to prevent noise pollution.  The majority of noise when driving is wind noise.