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Think of the port shapes of a cylinder head when you look at the internal surfaces of Magnaflow’s stamped X-pipe. The smooth radiuses and transitions contribute to airflow just like a well-designed short-side radius or a good valve job (in fact, its designer says the shape was inspired by the ports in a Dart Big Chief Pro Stock head!). Magnaflow’s universal X-pipe (PN 10789) is designed for 21/2-inch tubing in and out. For our system, they split the exit side open to accommodate the larger 3-inch pipe.
H-Pipe, X-Pipe, 1, 2, 3...

Think of the port shapes of a cylinder head when you look at the internal surfaces of Magnaflow’s stamped X-pipe. The smooth radiuses and transitions contribute to airflow just like a well-designed short-side radius or a good valve job (in fact, its designer says the shape was inspired by the ports in a Dart Big Chief Pro Stock head!). Magnaflow’s universal X-pipe (PN 10789) is designed for 21/2-inch tubing in and out. For our system, they split the exit side open to accommodate the larger 3-inch pipe.  View Related Article