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Just installed the Flowmaster catback exhaust..
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03-14-2006, 07:12 PM
Colby
Hummer Novice
Join Date: Feb 2006
Posts: 15
Yes, this is the 50 series muffler. It was surprisingly mellow; borderline too mellow. I can talk on the OnStar phone while cruising and the party on the other line can't hear the exhaust.
Colby
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