What gets me is he says the ET didn't change at all. You would think something would change for better or worse. That's what makes me think there is something wrong with the fuel system. There was probably more in the original combo but something is holding it back and what ever that was it's also limiting the new combo.

And I have never been able to squeeze those kind of numbers out of a nearly stock fuel system. The heat here is probably a factor in that though.

I tend to over build my fuel systems just so I know there is enough. I used those same two blue pumps and 3/8 lines when I ran a single 950 with each pump feeding one bowl.