How much do i cut off the pipes for Powerstroke IC???

[GS70350]

hey guys, for those who have installed the powerstroke intercooler on their cars, how much did you cut off of your mandrel bends so that they would fit together correctly? i have 2.5 inch piping, since that seems to be the easiest to use. intercooler is about on now. just gotta cut the header panel out.
Thanks
Jacob Morse