Yes I have flex Pipe in that piece. I don't really have many pictures of it, as I fabbed it and installed it and called it a day.
On my example, the upper red part is hard pipe. cut at an angle, and welded to the flange. The green part is the flexible tubing that I got from JCwhitney (1.25 or 1.5" I can't recall). The flexible tubing then slides atop more hard tube (again in red at the bottom) where it recirculates back into the downpipe (secured via that guillotine clamp). Could I have fabbed it with all hard pipe? Sure...but the flex tube was available and easy to use. It's a MFer to weld with a mig (I'm also not a perfect welder) so just be careful with it, or have someone tig it. I had the mig super cold, and very fast to keep it from melting.
