I have the PipeMax software and have been running some numbers through it, and the total lengths are coming up at what seems pretty long, around 40"? It this from the valve (subtract the exhaust port length from the 40"), or is that 40" from the header flange?

I am looking for mid range torque from the 440 in the Jensen, and looking at a Tri-Y design.
Pipe max lists a two step, and a three step Tri-Y?
Is the first step of the three step, just a pipe step before the "Y"?

I think the paring for the "Y"s are 1&5, 2&4, 3&7, 6&8?