Fenderwell headers.....again

So I just watched a newer engine masters where they tested several different styles of headers on the dyno. The fenderwell did not sacrifice a bunch of power. They actually made more power than the dyno headers with an 18inch extension. It's on MT on demand now. Pretty good watch.
Yea! That was pretty good and I was very curious at what they would find across the line of headers.
I’ve always heard people eat on the fender well headers and there really long tubes. But they were made for a reason. Besides shoving a BB into a small car that is....