Yes. All the Brembo multi-piston calipers are aluminium. The D2 S8 and RS versions are split calipers meaning they are two halves bolted together. The Porsche 17z and 18z are monoblocks so a single casting (hence a lot lighter but also more expensive to make).
Many of the Audi sliding calipers are a combination of aluminium and steel. The HP2 on later D2s for example has an aluminium piston housing but steel slider and pad carrier. I think the D3 360s are mostly aluminium too.
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