If you are talking about the downpipe coming off the turbo on a 2019 and earlier 45, you do not need to remove the turbo to get it out, but yes it is a royal pain in the butt.
you need an old shipping box to protect your radiator.
After much hemming and hawing, I found it easier to pull it out from the top rather than the bottom, but indeed it comes out like a tetris puzzle. Each 2-3 inches of removal and you have to rotate it or angle it a new way. At one point it is wedged good in there, and having the cardboard prevents dinging your radiator.
It's either AMS or Weistec that makes a very good instruction set for removal, but it does not give you a step-by-step for each angle and rotation. But it does give the proper outline.
good luck.