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I live around Saint Louis and we have strict emission laws. If i get my SLP Loudmouth Catback will it affect the exhaust in any ways that are bad?
 

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As long as you have your cats i think you'll be alright. But think about how many people drive around without them.
 

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Depends. Some do and some don't.

First, is federal emisssions standards. Anything that changes the function, design, or location of the cats is illegal. Headers must have a CARB number.

The other issue is noise. In most cities, anything that increases the noise over stock is illegal.
 
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