I cannot remember the size, I think the o/d may be 10mm, it just looked like a pea shooter compared to the 044 inlet size. I would have preferred bigger to know I was flooding the back of the pump as much as poss.
It obviously flowed enough to make the numbers on the dyno but I wonder if I will run in to issues later, especially as I MAY go for the long stroke option which could be as high as 580 bhp and torque to match.