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Yes, unlike the N54 where these can be replaced on the side of the road in 30 seconds, they're almost impossible on the N55 with all the hoses and wires and that very tight fit. Those things are so damn tight I had trouble getting them back in!
I recently removed mine for a 100K mile cleaning (which they absolutely did *not* need!) so I didn't want to touch any of the plastic. Knowing that the sealing surface is deep inside the bore and that the metal solenoid housing has a small steel flange all the way around, I found a small thin screwdriver that I could wedge into the junction to pry them loose. In the end it only took about an hour to remove/reinstall those 2 10mm bolts plus about 2 hours to remove/reinstall the solenoids.
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