Weren't there some issues with headers OTHER than ARH, Kooks, and Borla...with O2 sensors getting fouled up and needing to have new bungs welded in at different locations & angles? A friend of mine ran into this issue with Pypes LT's.
I have stainless power no issues here. I've seen ebay headers make just as much as the competition. This may just be me Kooks headers aren't a true traditional longtube header and more of a mid-length.