The bearings used in a CT are freefloating meaning they have Oil on each side of them in use and this "should" centre the shaft as long as nothing is actually bent.
Hard to tell from those Vids, is it rubbing the housing at all?
Personally if you have doubts I wouldn't run it as if it does let go it's going to cause more damage than just the Turbo.
I don't drink alcohol so I can't even use that as an excuse ;)
(it was just a DOH moment)
As for the "pull the fill plug first" discussion if it's a worst case scenario and you can't get it undo you can always pop a stub axle and fill it through there (Better than 15+ year old oil)
There will be up/down movement at the centre bearing as it's rubber mounted.
With the car jacked up on stands in neutral and e-brake off grab the Slip yoke and see if you can feel any movement.
Also go through each Uni and try the same.
Without spending a shitload of hours on a flow bench it's all guesswork taking the basics I've outlined into account.
Problem with the flowbench is it's NA and the FFIM will behave very differently under positive pressure.
Lost wax is a nice way to build as it allows for a LOT of detail...
"Risers" as in velocity stacks?
As far as I can gather it's not a great idea for forced induction as it upsets flow when positive pressure but does help out off boost.
Agreed there's not a lot of hard fact to be found on plenum design that's why I ended up making 1 at each end of the range...
I stretch them out then feed the start in enough so it will stay put then use a plastic probe (handle of my deburring knife) to carefully press the rest in moving back around the lock.
The rounded cap on a ball point pen would work.
When I get to the very end I try and catch it with a...
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