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4" Stainless Downpipe Back Single NO Muffler
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        4" Stainless Downpipe Back Single NO Muffler | 2011-2015.5** GM 2500/3500 6.6L DURAMAX (FLO-PRO)

        SKU: 432017

        Upgrade your truck's performance with the 4" Stainless Downpipe Back Single NO Muffler exhaust system, engineered specifically for the 2011-2015.5 GM 2500/3500 6.6L Duramax. This high-performance system, crafted from durable aluminized steel or T409 stainless steel, ensures optimal airflow and efficiency, while its easy installation with included clamps and bends simplifies the process for any enthusiast. Experience noticeable horsepower gains and cooler engine temperatures – unleash the full potential of your Duramax and enjoy unparalleled truck accessories today!

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        Mel’s Manufacturing
        Vehicle Specific
        Check if this part fits your vehicle.
        • Brand: Mel’s Manufacturing
          • 3% off
          $1120.00 save $33.60
        • $1086.40

        This high-performance exhaust system, crafted from durable 16 gauge aluminized steel or T409 stainless steel, is engineered for optimal airflow and efficiency. Designed for the 2011-2015.5 GM 2500/3500 6.6L Duramax, it simplifies installation with included clamps, contour bends, and improved flanges, ensuring a seamless fit. Experience enhanced horsepower that you can actually feel and hear, along with reduced exhaust gas temperatures for a cooler engine performance.

        Mel's Manufacturing has meticulously designed this system not only for race enthusiasts but also for those seeking an unparalleled upgrade for their truck accessories. Please note that this product is intended for non-registered racing vehicles, ensuring top-notch performance on closed-course events.

        Unlock the full potential of your Duramax with this performance upgrade today and drive with confidence knowing you have the best exhaust system on the market.

          • SKU
            432017
          • Weight
            74 lbs
          • Manufacturer Part #
            SS864NM
        • Material
          Aluminized, Stainless
        • Muffler
          With Muffler, Without Muffler
        • Brand
          Mel’s Manufacturing
        • Manufacturer
          Mel's Manufacturing
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        Shipping Times

        Most customers will see their parts within 3-5 business days. We will primarily ship with Purolator ground & DHL Express to ensure the fastest shipping possible.

        Please Note: These are only estimates and shipping time may vary depending on your location, out of country and rural locations expect longer wait times.

        Where Do We Ship 

        We will ship our products within Canada and the United States.

        Please Note: There are limitations what can be shipped to the United States.

        Damaged Shipments

        We provide the option to purchase insurance as we are not responsible for any damage while with a courier, we don’t often see issues, but it does happen. If you purchased insurance we will put in a claim, if no insurance was purchased there will be no refunds or exchanges.

        We accept the following payment methods:


        Return Policy

        It happens sometimes we would like to return it. Here are our return rules:

        • Prior to any return you must contact us and get an approval for a  RMA number
        • Product must be unopened and have no damage. 
        • You must pay for the shipping back, please insure so if anything happens you can make a claim, we are not responsible for damage during shipping and is the sole responsibility of the customer.
        • Regular products are subject to a 5% Restocking fee.
        • Items over 50 lbs. or special orders will be subject to a 20% Restocking fee.
        • Electronics & Tuning is a final sale and cannot be returned. 
        • Fitment Type
          Vehicle Specific
        YearMakeModelNotes
        2011GMCSierra 2500 HD
        2011GMCSierra 3500 HD
        2011ChevroletSilverado 2500 HD
        2011ChevroletSilverado 3500 HD
        2012ChevroletSilverado 2500 HD
        2012ChevroletSilverado 3500 HD
        2012GMCSierra 2500 HD
        2012GMCSierra 3500 HD
        2013GMCSierra 2500 HD
        2013GMCSierra 3500 HD
        2013ChevroletSilverado 2500 HD
        2013ChevroletSilverado 3500 HD
        2014ChevroletSilverado 2500 HD
        2014ChevroletSilverado 3500 HD
        2014GMCSierra 2500 HD
        2014GMCSierra 3500 HD
        2015GMCSierra 3500 HD
        2015GMCSierra 2500 HD
        2015ChevroletSilverado 2500 HD
        2015ChevroletSilverado 3500 HD