The top of the flanged downpipe is wider then the widest point of exhaust manifold output flange so, when you tighten it using the provided two bolt retainer clamp it tops out on the manifold before making the flange to flange joint tight. I'm sure that alot of people have had good experiences with them, unfortunetly I got pipe that was out of there admitally normal tollerences, modified it per there instructions and now still have a problem.
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