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I just installed the GHL Magnum Plus which use the same 6 inch muffler as the bullets. Below 3k there are really pretty mellow. Over 3500 they start to talk. At 5k they are yelling pretty loudly.
I've got a full H/C setup which increases the volume. Headers only will be quiter than my car.
BTW, took off a Z06 exhaust and had the Corsa Indy's before that. Now those were loud.