You could try Tom, he's not doing turbos anymore but he might still have a few manifolds laying around that he'd be willing to sell, be it his new tubular design or the older log-style. Aside from that, I can't think of anyone who sells a turbo manifold by itself...you could try e-bay, and I've seen a few setups where they use a shorty 4-1 header with a short adapter to go from the three-bolt flange on the header into the inlet on the turbo.