I definately say BBK. I have the MAC equal shorties, and HiFlow50 is right, they warp. I bought them used, got a great deal, it took me all day to put them on. We had to use a pry-bar to line up the flanges with the heads. After all that I still had a leak. I bought an Bassani o/r X pipe, and had to cut it, bolt it to the header, and weld a sleeve onto it to cover the gap because it wouldn't fit.
From what I hear, BBK's fit great.