I bought a used header, should i clean the carbon out of it? or will it not even make a difference? its by no means "clean" theres plenty of carbon inside. If i do decide to clean it how do i go about in doing so?

thanks

 

You could try flushing the insides with seafoam, but its going to get carboned up again anyways.

 

send it to a shop to get it cleaned, hot tank it

 

you will gain horsepower for about the first 100 miles and then it will be back to how it is now