Round-port long-branch manifolds work, but are more expensive than custom headers.
We've got a set or R.A.R.E. round-port long-branch manifolds with the larger (2 1/2") collectors.
It's the only 2 1/2" collector set that I've ever seen 'in the wild'.
We had a pair of factory RAII manifolds several years ago that we sold for $2500.
We'd sell our oversize R.A.R.E. manifolds for $3k for the pair.
They're like new, but have been run minimally.
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