The super Duty system I got from Gardner had I believe 2 1/2'' head pipes and Eric explained if I wanted that exact SD copy I would have to weld the elbows just off the manifolds as they are 2 1/4'' to fit through the round manifold clamps. My system looks identical to yours other than the motor ends of the head pipes, very nice fit. I just feel that elbow looks restrictive compared to the rest of the system.
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