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I have 2001 250 7.3. It still has the stock exhaust without cat. If I upgrade to a 4” exhaust will I need to add a cat to pass smog in Washoe county, Nevada?
 

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I don't know about NV specifically but in States with Emissions Inspections it depends on whether your 7.3 PSD originally had a Cat or not. The sticker on the valve cover will indicate if it did and if it did then you need to have one installed to pass the visual inspection.
 
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