I got my HFC's used for $300 bucks, you wanna talk about a change of the exhaust note, thats your best bet, and I picked up 12whp and 10ft/lbs. This baby screams between 3500-5500 rpms!
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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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