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2021 Mustang GT Oxford White Black Accent
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Any suggestions on headers that will open up from stock but have a cat so I don’t have to do an exhaust swap every time I have to smog it? I’m aware I can use a back door smog place and get it through, I don’t want to do that.
 

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Any suggestions on headers that will open up from stock but have a cat so I don’t have to do an exhaust swap every time I have to smog it? I’m aware I can use a back door smog place and get it through, I don’t want to do that.
IMHO, don't count on the "Back Door Place' for your smog check, typically they last a very short duration and are shut down with the mechanic and/or owner "done" in the mechanic business for good.
 
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