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I would say it is more of a tone change. Louder, raspier and deeper with them open. From inside the car I noticed this becomes most prominent on deceleration. Either mode is great going down the freeway. It sounds good to me and this DIY thread showed another way to make it functional while saving some cash.
Quiet mode is not going to be like the minivan next to you at the stop light. Bi-modal is a cool feature, but some people just leave the valves open. At least you have an option to close the valves if needed.
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