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With dpfix installed, you have nothing to worry about on the scan side of things as long as it is working correctly. However, it is not hard to spot aftermarket dps. All the tech has to do is look down the passenger side of the engine bay. There's a huge difference between stock and 3 inch pipes. The techs look at cars all day and can spot differences. Would they void the warranty while during an oil change or brake service? In my personal experience, no. Keep in mind in order for the car not to throw a code while being catless requires a tune or dpfix. I would assume most dealers know this....mine did. Good luck.
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