I believe the H pipe will actually produce more low end torque and less of a high end gain, while the X pipe produces a little mid range torque with a higher top end.
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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