the HFC's just add a great sound to the overall note I think, you might see gains of up to 5 additional hp, but the Stillen CBE just sounds amazing when you open up the cats.
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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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