What kind of RPM are you turning? I've posted some dyno results a while back, April or May. I was having my 535 dyno'ed and I did a intake shoot out. The 4 barrel was king, a heavy modified M1 and made I think 20 horse over the 6-pack, the 4-barrel made 12 horse over a tunnelram and I tryed a mopar crossram, it was a piece of junk. All of the manifolds were ported. just my