You guys can blah blah all day long, I along with others have proven "fact" that those headers are restrictive compaired to a long tubed 1.7/8 headers on even the mildest 440s, they are also shorties, so that right there is not the best, if you don't beleive me, you can call shuamacher himself, he will tell you plain & simple that they will NOT give you all out power like a true long tubed design, so you can say all is BS or whatever, 440s respond to a good header, who gives a rats *** about Dynos, i know guys that have spent all there coin tuneing there **** on a dyno, just to hit the track & go slow LOL, who's BS-in who!! Show me a full bodied "440" A body that'll run low 11s with the shuamachers, PLEASE make ME a beleiver, & i'm talking full body not stripped.
I will also say you can call them "mid-range" whatever, When i switched over to a "real" header i picked up ALL over the "whole" powerband. I see so many guys wanting to go "fast", but they scimped in the wrong areas.
But like i said earlier, if your "not" looking for the most out of your 440 then get the shuamachers, i'm not saying there "junk", they are just limited.