this could lead toa nice question then...I don't know many other (high perf.) engines running 1+2 & 3+4 primaries, so I'm still convinced that a proper designed 1+4 & 2+3 manifold will be beneficial for the 2,2...
Would an unequal length 1+4.2+3 manifold be better than an equal 1+2.3+4 (or even 4-1)