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Quick question if you change out your stock exhaust on a LB7 to a 4" straight pipe do you have to do a tune or is it will it be ok without.
 

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No need for a tune on just an exhaust on most LB7's unless you have one with the California emissions.
 

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Nothing on 5" either that I found.
 

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Nope. Good to go.
 
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