I keep on seeing these Radiator Caps JDM Nismo branded or just JDM branded..whatevers. They state it helps by raising the pressure in the radiator which helps with cooling and in turn helps with the performance gains in the car. Or whatevah they state it helps with. Is it true that a Radiator Cap can help cool down the flow and increase performance? Because these caps look just plain regular to me like any other, but it has a sticker on them with a JDM brand or another brand. Or is it only good in the Cosmetics Cat. of performance? any opinions?

 

im pretty sure u can get 5 hp from the radiator cap just like my stillen liscence plate frame