I can almost guarantee you that its a leak where the ART pipes meet the exhaust manifolds. The new ART pipe format will have a factory style o-ring seal that will not leak. It's the only way to avoid that problem in my opinion.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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