Just watched the c43 installation video, and you should be fine doing the downpipe install on the 63. Steering column removal isn't necessary, but I did it, and was easier to pull the downpipe out. CUT THE PIPE before you loosen the downpipe from all the clamps and bolts holding it. I had the downpipe fully loose when I started cutting it, and it made it so much harder than it needed to be since the downpipe kept moving lol. Lastly, in the video I linked below, the bolts behind the shield at 8:00 were terrible to reinstall so I recommend having a skinny socket so you have as much space as possible. My total install time took 5 hours, and getting those bolts in took an hour and thirty because I kept dropping it or it wouldn't line up.