^^ That's not the whole story though. You could try a 180 thermostat and the temp would be regulated at a cooler temperature. Right now the purpose of the stat is to make the engine run at 195, which makes it easy to get to 210 in traffic. If you put a 180 stat in it, the temperature will regulate at 180, making it more difficult to spike at 200.

But yes a properly set up fan shroud can make a big difference.