i'd say those numbers are right on par with where they should be, everyone has different parameters set on their dynos and different altitudes, humidity, all sorts of things effect the power numbers, so far it seems 280whp is the avg.
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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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