Ford Mustang Forum - View Single Post - 2011 GT longtube headers quieter than stock
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post #9 of (permalink) Old 02-26-2016
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If it truly is that quiet, then it must be the new cats... Are you talking about being quiet inside of the car or outside? It seems like you are talking about cockpit exhaust noise. It may be louder than you think outside (at speed).

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