Texas requires one, had mine for 6 months and still havent put mine on, i keep it in my front seat and put it in the window for long drives, no trouble from the cops at all.
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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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