Radiators
It is worth remembering that a third of the engines power can be converted into heat energy and any increase in engine power from tuning will result in an increase in heat output that will need to be accommodated by the cooling system. A rule of thumb; 30% more power output equates to 30% more heat output.
Aluminium radiators can provide over 30% more cooling and are often 40% lighter than traditional copper and brass radiator construction.