Is there a real benefit in fitting a aluminum header tank? I’d like to fit an uprated cap with a higher opening pressure to increase the cooling capacity. But can the standard header tank take the increased pressure? I guess the aluminum tanks are ok with the pressure, but I don’t like the fact that you cannot see how much coolant is in there. I know there are tanks with a small glass in there, but still the original tank is more convenient. So why do people change?

And what is the reason to fit a swirl pot?