Header question

[W1N]

Hey,

I'm planning to upgrade the performance of my H2 with after market headers. I'd like to hear from somebody that already has done some moding some opinion about different options I have. Without having much of experience the ones that H2S Online Store sell look pretty good...

Can you really tell the difference of the truck once you have performance headers installed and do they really give you that ~14hp?

Thanks!