so is their really a difference in the way most aftermarket radiator caps that are designed to raise boiling pressure perform. Or do you pay more for the Brand name. For Example Cusco and skunkII cost about half the price of the spoon and mugen. do these radiator caps perform any different

 

Use a stock pressure cap, with a higher pressure cap, you run the risk of boiling the coolant internally, and creating a hot spot in the head, which could lead to a crack.