By using the Formable Pattern, and drawing out the header pipes on graph paper. I was able to find that I needed to bend the first header cone thru' 140 Degrees. The next cone needed to be bent thru' 33 Degrees. I then used MOTA to print out the cones pieces and then cut the paper printouts up and taped them together. This is a good way to prove your pipe will fit.
So how do you bend a cone?