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4" Stainless Downpipe Back Single Without Muffler | 2020-2023 GM 2500/3500 6.6L DURAMAX L5P (FLO-...
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        4" Stainless Downpipe Back Single Without Muffler | 2020-2023 GM 2500/3500 6.6L DURAMAX L5P (FLO-PRO)

        SKU: 432028

        Unleash your vehicle's potential with the 4" Stainless Downpipe Back Single Without Muffler, expertly engineered for 2020-2023 GM 2500/3500 6.6L DURAMAX L5P models. This high-flow design promotes exceptional airflow, leading to significant performance enhancements and lower EGTs while ensuring an easy installation process with included clamps. Transform your machine into a powerhouse with a commanding sound and experience the thrill of improved performance today—upgrade now!

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        Mel’s Manufacturing
        Vehicle Specific
        Check if this part fits your vehicle.
        • Brand: Mel’s Manufacturing
          • 3% off
          $1190.00 save $35.70
        • $1154.30

        The 4" Stainless Downpipe Back Single Without Muffler, designed specifically for the 2020-2023 GM 2500/3500 6.6L DURAMAX L5P, offers unprecedented enhancements in performance and efficiency. Constructed from 16 gauge aluminized steel or T409 Stainless, this exhaust system facilitates straightforward installation with its included clamps and pre-weld contour bends. Experience a substantial improvement in airflow, resulting in increased horsepower and reduced exhaust gas temperatures (EGTs). Ideal for non-registered race vehicles, its high-flow design unlocks your engine’s full potential, promising a powerful growl that signifies strength. Upgrade your vehicle today and feel the difference in performance and sound.

        Note: This system is suitable for models with an OEM style 4-bolt flange from the turbo direct pipe. It is important for users to be aware that using this part on emission-controlled vehicles may violate state or federal emissions laws.

        Contact us to learn more about how Mel's exhaust systems can elevate your driving experience.

          • SKU
            432028
          • Weight
            63 lbs
          • Manufacturer Part #
            SS20141NM
        • 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
        2020ChevroletSilverado 2500 HD
        2020ChevroletSilverado 3500 HD
        2020GMCSierra 2500 HD
        2020GMCSierra 3500 HD
        2021ChevroletSilverado 2500 HD
        2021ChevroletSilverado 3500 HD
        2021GMCSierra 2500 HD
        2021GMCSierra 3500 HD
        2022ChevroletSilverado 2500 HD
        2022ChevroletSilverado 3500 HD
        2022GMCSierra 2500 HD
        2022GMCSierra 3500 HD
        2023ChevroletSilverado 2500 HD
        2023ChevroletSilverado 3500 HD
        2023GMCSierra 2500 HD
        2023GMCSierra 3500 HD