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2011-2014 Mustang GT Mid Pipes

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The 2011-2014 Mustang GT exhaust is nice from the factory, but still traps a lot of horsepower.  Vehicle owners can see significant results with simple upgrades, or larger results with a complete system replacement.  JMS has tested and used a wide variety of assemblies and combination of parts.  As a result, we have documented a host of mixed and matched components, and logged a considerable amount of dyno hours.


Mid-pipes are another common upgrade to the 2011-2014 Mustang GT and these types of assemblies may also be referred to as; cat-pipes, x-pipes, h-pipes, cat-delete pipes, or high-flow catalysts.  It's essentially the exhaust assembly that runs from the exhaust headers to the cat back exhaust system.  When considering these products, we also highly recommend you use stainless steel tubing for long life and reliability.  Also consider catalysts vs. no cats, and note your local emissions testing requirements to stay in compliance.  Some packages may use high-flow catalysts, but it's important to know whether they have a EO number as issued by CARB and are 50-state legal.  Also note that factory and aftermarket catalysts are likely just as free-flowing as a tube with no cats at all.  In most cases, when you replace the mid-pipe, you are required to recalibrate the computer ECU to compensate for any changes to the oxygen sensor locations and increased air flow.