{"product_id":"mbrp-15-5-16-gm-duramax-6-6l-3-inch-downpipe-kit-for-silverado-and-sierra-2500-3500-hd","title":"MBRP 15.5-16 GM Duramax 6.6L 3-Inch Downpipe Kit for Silverado and Sierra 2500\/3500 HD","description":"Replace that restrictive factory downpipe with a MBRP direct replacement downpipe for more flow, fuel economy, and better performance. Removal of OEM catalytic converters may be a violation of emissions laws in your jurisdiction. Ensure that the intended use of this product is permitted. Not for sale or use in the state of California.\nArmor BLK Turbocharger Down Pipe; 3 in.; Black Coated; For Use w\/3 Bolt Flange Style Connection; 4 in. Outlet Diameter Tip;\nOnly Works With A 3 Bolt Flange Style Connection.\n\u003cul\u003e\n  \u003cli\u003eDirect Replacement. 20% Increased Flow Over Stock. Richer Diesel Sound.\u003c\/li\u003e\n  \u003cli\u003e20 Percent Greater Flow Over Stock\u003c\/li\u003e\n  \u003cli\u003eWill Not Affect Emissions\u003c\/li\u003e\n  \u003cli\u003eGains Of +21 Horsepower\u003c\/li\u003e\n  \u003cli\u003e24 lb.\/ft.\/ Torque Gain\u003c\/li\u003e\n  \u003cli\u003eGreater Heat Retention\u003c\/li\u003e\n  \u003cli\u003eRicher Diesel Sound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUpgrade your 2015 Chevrolet Silverado or GMC Sierra 2500\/3500 HD with the MBRP part number GM8428 3-inch downpipe kit designed specifically for Duramax 6.6L engines. This direct replacement downpipe offers significant improvements over stock components, including a 20% increase in exhaust flow, which contributes to better engine performance and efficiency. Constructed with a durable black-coated finish, this downpipe effectively retains heat, promoting optimal exhaust scavenging and maximizing power gains. The kit is engineered for a seamless fit with a 3-bolt flange style connection, ensuring straightforward installation and compatibility with your vehicle's existing exhaust system. The enhanced airflow and increased heat retention translate into notable gains of approximately 21 horsepower and 24 lb-ft of torque, delivering a more aggressive diesel sound and improved overall performance. Please note that this product may not comply with emissions regulations in all jurisdictions, and removal of OEM catalytic converters could be illegal in some areas. Ensure the intended use aligns with local laws before installation. Crafted for durability and performance, this downpipe is ideal for truck enthusiasts seeking to optimize their vehicle's power output and sound profile while maintaining a robust and reliable exhaust system.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eDirect replacement for OEM downpipe, ensuring a perfect fit\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e20% increased exhaust flow over stock for improved performance\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eConstructed with black-coated steel for heat retention and durability\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCompatible with 3-bolt flange style connection\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eGains of approximately 21 horsepower and 24 lb-ft torque\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eEnhances diesel sound for a richer driving experience\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned for use with 2015 Chevrolet Silverado and GMC Sierra 2500\/3500 HD Duramax engines\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eNot for sale or use in California due to emissions laws\u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2015 Chevrolet Silverado 2500 HD High Country\u003cbr\u003e\n2015 Chevrolet Silverado 2500 HD LT\u003cbr\u003e\n2015 Chevrolet Silverado 2500 HD LTZ\u003cbr\u003e\n2015 Chevrolet Silverado 2500 HD WT\u003cbr\u003e\n2015 Chevrolet Silverado 3500 HD High Country\u003cbr\u003e\n2015 Chevrolet Silverado 3500 HD LT\u003cbr\u003e\n2015 Chevrolet Silverado 3500 HD LTZ\u003cbr\u003e\n2015 Chevrolet Silverado 3500 HD WT\u003cbr\u003e\n2015 GMC Sierra 2500 HD Base\u003cbr\u003e\n2015 GMC Sierra 2500 HD Denali\u003cbr\u003e\n2015 GMC Sierra 2500 HD SLE\u003cbr\u003e\n2015 GMC Sierra 2500 HD SLT\u003cbr\u003e\n2015 GMC Sierra 3500 HD Base\u003cbr\u003e\n2015 GMC Sierra 3500 HD Denali\u003cbr\u003e\n2015 GMC Sierra 3500 HD SLE\u003cbr\u003e\n2015 GMC Sierra 3500 HD SLT\u003cbr\u003e\n2016 Chevrolet Silverado 2500 HD High Country\u003cbr\u003e\n2016 Chevrolet Silverado 2500 HD LT\u003cbr\u003e\n2016 Chevrolet Silverado 2500 HD LTZ\u003cbr\u003e\n2016 Chevrolet Silverado 2500 HD WT\u003cbr\u003e\n2016 Chevrolet Silverado 3500 HD High Country\u003cbr\u003e\n2016 Chevrolet Silverado 3500 HD LT\u003cbr\u003e\n2016 Chevrolet Silverado 3500 HD LTZ\u003cbr\u003e\n2016 Chevrolet Silverado 3500 HD WT\u003cbr\u003e\n2016 GMC Sierra 2500 HD Base\u003cbr\u003e\n2016 GMC Sierra 2500 HD Denali\u003cbr\u003e\n2016 GMC Sierra 2500 HD SLE\u003cbr\u003e\n2016 GMC Sierra 2500 HD SLT\u003cbr\u003e\n2016 GMC Sierra 3500 HD Base\u003cbr\u003e\n2016 GMC Sierra 3500 HD Denali\u003cbr\u003e\n2016 GMC Sierra 3500 HD SLE\u003cbr\u003e\n2016 GMC Sierra 3500 HD SLT\u003cbr\u003e\n2017 Chevrolet Silverado 2500 HD High Country\u003cbr\u003e\n2017 Chevrolet Silverado 2500 HD LT\u003cbr\u003e\n2017 Chevrolet Silverado 2500 HD LTZ\u003cbr\u003e\n2017 Chevrolet Silverado 2500 HD WT\u003cbr\u003e\n2017 Chevrolet Silverado 3500 HD High Country\u003cbr\u003e\n2017 Chevrolet Silverado 3500 HD LT\u003cbr\u003e\n2017 Chevrolet Silverado 3500 HD LTZ\u003cbr\u003e\n2017 Chevrolet Silverado 3500 HD WT\u003cbr\u003e\n2017 GMC Sierra 2500 HD Base\u003cbr\u003e\n2017 GMC Sierra 2500 HD Denali\u003cbr\u003e\n2017 GMC Sierra 2500 HD SLE\u003cbr\u003e\n2017 GMC Sierra 2500 HD SLT\u003cbr\u003e\n2017 GMC Sierra 3500 HD Base\u003cbr\u003e\n2017 GMC Sierra 3500 HD Denali\u003cbr\u003e\n2017 GMC Sierra 3500 HD SLE\u003cbr\u003e\n2017 GMC Sierra 3500 HD SLT\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; 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