Pretty sure you'll end up with noise if you don't use them. A couple of years ago I had struts assembled by a local shop and the top insulator was bulging out. I posted a picture on here and some knowledgeable people told me I could end up with a noisy strut.
I think the metal on metal contact would be noisy and would wear something out.
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E82 / BMWP Springs / Koni Yellows / M front control arms / Adjustable front endlinks / M rear guide rods / Whiteline Poly RSFB
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