I left my PAS pump on 1z engine as it was originally on the Audi A4 1996.
It is indeed the lowest component in the engine bay now, but I fail to see it knocked off by ANY speed bumps (unless I drop the van by at least 250mm).
As I am working on the van right now, I can crawl underneath it (and under the PAS pump) without touching anything.
Have you EVER seen a speed bump fatter than me!?
I don't think so.