Great info, Brian!

I still kinda think my lower plenum mods would pretty much even up the HP/TQ score, kind of suprised the torque peak was lower with the 2D though, at what RPM did the 337 take over?

Did you port match the 337 or did you run it out of the box? I was suprisedthat as delivered the 337 ports are not full MW sized, kind of 1/2 way between Maxie and 906....my old stage VI's and ported Street Dominator were a tad larger than that ....which leads me to believe the 337 could actually work on a 906 sized head if it were opened up to match.