hmm... sounds a bit fishy, while all dynos will read differently, they shouldnt differ that much. I've never seen a Z on this board dyno less than 260 on a dynojet in stock form, with your exhaust you should be dynoing much higher, closer to 280-290. Yours look like mustang dyno numbers.
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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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