I don't know if they make any differance but hey a cheap upgrade. RALLIART cap hi pressure DESCRIPTION: A 1.3 bar radiator cap will reduce operating temperatures in your engine and is a great performance add on. If you're running a higher pressure on your cooling system it helps keep the temperature down on the entire system, by raising the boiling point of the coolant. This will help during hot operating conditions like running the air conditioning while climbing hills, long road trips, bumper to bumper traffic, and high performance track or strip driving. It's especially helpful if you live in a warm climate.