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Discussion Starter · #1 · (Edited)
If I already have a custom tune fitted to the mods I have on the vehicle would I have to get a retune if I get a different brand exhaust system??
 

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Probably. But the only person who can answer that for sure is your tuner.
 

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BooSTIng
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If you are just replacing your catback, you should be fine. But if you are changing your downpipe a revision might be needed. Depending on what you are changing out, consult with your tuner like @XJman mentioned.
 
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