Better for what, ?...roadracing or dragracing..?
Just asking, cuz my hooKer equipped K model had no trouble beating a certain 78750 F a buddy had..
I never saw a header adverised that did not promise at lerast 10% gain, ever..
Sorry about the comment earlier on the pipe, just do not remember any with the 2&3 pipe bowed like that, and probably remember megaphone details better than the connector pipe details...