Hey, I'm getting a 180-degree Stant SuperStat. I've heard some people talk about drilling a hole in the thermostat. What is the point of this? Also, I'll be draining the cooling system and adding fresh anti-freeze. What's the best way to drain the old coolant? I've seen those Prestone flush kits, but you have to splice the heater hose and add a plastic tee. Do you guys recommend using one of those kits? Also, do you recommend using those radiator flushing chemicals?