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The M button emits a message on the PT-CAN bus. My friend may know what it is, but I don't. Getting a sniffer on the PT-CAN bus is easy to wire in and there are DIY's out there for that. You can sniff the PT-CAN for the message, then trigger a 5V output which would then control your valved exhaust. It's actually pretty easy, but you have to be very tech and electronics savvy to do it.
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