FI = Car looks modded so sleeper is out, good gains, sound.
Stillen = Car looks stock somewhat (for those who dont know any better) equal gains, awesome sound, I absolutely love the way my car sounds.
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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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