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Great product
Used these to make the exhaust manifolds for my 350Z twin turbo build. Fit perfectly and made 550 whp on the dyno with them on (with small turbos and 1.25" sch 10 runners)
I purchased this flange set to fabricate a custom turbo manifold setup for my 350z. first off the flange is a very precise fit, it matches the ports on the head perfectly. the ports are milled to transition to sch 10 1.5" piping which save a lot of work in the long run. I am very happy with the quality of this part.