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I have no idea how loud this one is. I tried it out while test driving the truck but was not towing, was at about 55 mph on flat road and just went off throttle. There was a change in exhaust note but it was more of a soft purr. But under load it might be totally different. It's a turbo exhaust brake, with a plate that closes off the exhaust on the outgoing side of the turbo, if I understand it correctly.
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