e-cutout stuck closed
Mine usually does it if I close it while the car is hot and let it cool down. then the case shrinks on the butterfly and it gets stuck
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Hell, I don't know physics, and it makes perfect sense to me. The only way it wouldn't cause a power loss is if it had a flap, that when closed made a perfect closure over the exhaust pipe, and when opened then flopped over and obstructed the exhaust pipe which in turn would divert exhaust out of the cut-out. Please tell me you follow what I said, so I don't have to bust out ye ole M$ Paint






