I'm not sure if this is totally in the right forum, but her it goes:

I recently acquired a DC 4-1 stainless header in ok shape but it does have the usual dents on the bottom 2 pipes from where the previous owner was riding extra dumped(1 of which is severe and I'm almost positive will affect the flow). I was wondering if there was a way to fix it without cutting up the header, more than what I'll already be having done to it(2.5" collector mod).