Wait till they overtake you, when they're level with your car accelerate to the point where there car has lost any amount of power to get past you and just sit there so they cant pull back in. Amuses me everytime.
I notice this more now I have the 180 maybe its the livery doesnt bother me as now I have the power to really leave them behind Or when you come to a roundabout a quick 360 and see how they like it