Dang. The only article i have seen directly comparing the two said that there was no difference in top end, and added that the 4-2-1 design increased the scavenging effect thereforte boosting power across the powerband until the 4-1 headers caught up at the top. Oh, it was a domestic magazine doing the article, comparing Doug Thorley Tri-Y headers to Hooker Super competition headers of equal collector length and primary diameter. Once i get my little ricer, i am sure that a 4-2-1 design will go under the hood.
Unless you guys know some articles i could look at to change my mind...