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There are some mods that simply void the warranty for that portion of the car. For instance if you modify exhaust then clearly GM will not cover any exhaust related issues. But if you had some other problem then you would be fine. As long as the failure is not linked to the modification you have made there is no issue. Now with guys that start cracking open the engines they open to door to all kinds of issues. As to the exhaust question you have, if you want it covered under warranty you should replace it with the factory system. Generally the insurance company will do this.
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