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[/QUOTE]I've found the easiest way to check if your valves are operating correctly is to start your truck up (warm) and then push the "M" button. You should hear a noticeable increase in exhaust drone or rumble. Then just take a flash light and take a peek inside either of the two outside muffler tips and you should see a circular flap that is half way open. If it's not, then there's a problem with it.[/QUOTE]
Just to confirm, it's inner/inside two mufflers not outside mufflers that have valves correct?
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