Depends on what you get.
Most of the time, the warranty can't be voided but a claim can be. That's where you run into the headache of getting a major service done when needed.
For Cat-Back exhausts (CBE), you are usually fine, but if you replace the headers and or delete cats they can call you out on a lot of things like emissions system parts and sometimes even the engine depending on what the problem is your having.
BK
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