Fast Intentions and Stillen make the same gains, with FI, you'll have to be put on a waiting list because they're made to order. Stillen looks more stock, either way you cant go wrong, leave the others alone.
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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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