But this is sub-ideal. Pipes have a huge url, a delay to long for practical use with Twitter, and are unreliable at times.
I searched the API for a solution but found none. The only official format for lists is XML and JSON.
Just by trying anyway, I and Jaap found out that lists do not have an RSS feed, but they do have an Atom feed(which is sort of RSS on steroids)! This can be used in most cases where an RSS feed is required.
The new way: