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I really want to delete my secondary cats and resonators but will this void my extended CPO warranty?
 

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I didn't have any issues with any of the dealerships I brought it to. It depends on your relationship with your SA. Exhausts are one of the first mods most people do anyway and they're hardly the cause for anything serious to go wrong with our beasts.
 

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Many warranties, BMW probably included prohibit modification of the emissions system. While exhaust cans probably don't constitute that, hard to argue secondary cats aren't.
 
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