It's a design that isn't used for H22 manifolds, there is usually somekind of join in the primaries for the H22. I would assume that the join is intentionally there so you can install the thing. It could be custom but to me it doesnt look H22.
Merlin wrote:I would bet that is not for a Prelude.
why do you think that? It looks like those H22a headers that you put in the Civic. I think it will fit with a bit of mod and with that price it went it was a f**king bargain.