Coolant additives or Waterless coolants ???
 

What, if any, high performance coolants or additives have y'all found to be worth the money?
Just a few i've seen would be and their claims if any;
Evans Waterless
Red Line Water Wetter (improves heat transfer and reduces cylinder head temperature)
Royal Purple Purple Ice
VP Racing Madditive Cool Down (reduces cylinder head temperatures up to 50 degrees F)
Lucas Super Coolant (reduce coolant temperatures by up to 20 degrees F)
DEI Radiator Relief (will reduce the temp as much as 30 degrees F.)