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Just got mine installed last week. Love the sound. Was very concerned about the drone and kept my cores in case didn't like the sound. No issues whatsoever. Not too loud and on the highway sounds stock unless you get on it a bit and raise the rpm's but then it settles down again irrespective of speed. Call Darin and you won't be upset w the results.
Is no one here in San Diego willing to give me a chance to hear your Gundo sounding mufflers?
I have a 2009 997.2 with the Fister Exhaust (more or less the same as a Gundo). No drone, and even civilized around the neighborhood if you keep it under 3k RPMs.
I'm in UTC if you wanted to come and check it out on Saturday.