Missed on this combo?

Next issue, my dyno guy calls me AT WORK today, on Sunday cause it's buggin' him too. He asked if I remember which pipes we had running out the wall. He said we might have used some 8 inchers that he was using to dyno some blown alcohol thing earlier in the week. He usually runs a 4 inch pipe from the header through the wall. Said if we did, that may have a LOT to do with the numbers. Especially torque.

I happen to take a couple pics that day and sure as hell those pipes don't look like 4 inchers coming off the header. Can that really make much difference?
It sure will. I once welded some 18" long, 3" diameter collectors in place of some 9", 2.75" diameter collectors, and picked up some very noticeable low end torque. (That was waaaay before dynos were common, and I was poor, so sorry, no numbers!) All of this effect has been documented and known for 60-70 years.... and I think RAMM mentioned this earlier.