HFC's were my first mod, and lemme tell you, improvement over the stock note was huge, not to mention the 15whp gain was very very welcome.
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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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