MagnaFlow 17870 Stainless 5" inch DPF-Back Exhaust | 2007-2023 GM Silverado/Sierra 2500HD/3500HD

Features:

• 5" mandrel-bent tubing for max flow
• Muffler delete for aggressive diesel sound
• 409 stainless steel resists rust and corrosion
• Polished 6" tip with intercooled design
• Improves turbo spool and throttle response
• Clamp-on install, no cutting or welding
• Maintains emissions compliance (DPF-back)
• Compatible with all Duramax generations
• No drone inside the cab
• Clean, rolled-edge tip for custom look
• Designed for 2007–2023 2500HD/3500HD trucks
• Built for tuned and stock applications

Give Your Duramax The Sound It Deserves

If you’re tired of your Duramax sounding like it's still stuck in stock mode, the MagnaFlow 17870 Pro Series Exhaust is the upgrade that changes everything. This system ditches the factory muffler completely, unlocking that bold, aggressive diesel tone you’ve been missing. Whether you’re daily driving or towing heavy loads, the deep rumble will make your truck sound as strong as it feels. And it doesn’t just sound good, the 5-inch stainless tubing helps reduce backpressure, improving throttle response and turbo spool, especially on tuned setups. The polished 6-inch tip adds the perfect finishing touch with an intercooled design that keeps surface temps in check and brings a clean, custom look to the rear of your truck. You won’t need a lift or a welder to get it installed either, thanks to the clamp-on design that bolts up easily using standard hand tools. This is a system built for real-world use, built for diesel guys who want performance they can hear and feel.

Built For Maximum Flow Without Sacrificing Compliance

The MagnaFlow 17870 Pro Series is designed for Duramax owners who want all-out flow and sound without interfering with emissions systems. This DPF-back exhaust system fits 2007–2023 Silverado and Sierra 2500HD and 3500HD models and uses 5-inch mandrel-bent tubing to keep exhaust velocity high and restriction low. The lack of a muffler allows for the most aggressive tone in MagnaFlow’s DPF-back lineup, while the system’s layout ensures compatibility with factory emissions components. Made from 409 stainless steel, it offers solid resistance to rust and corrosion in harsh driving conditions. The tip is a 13-inch long, rolled-edge stainless steel piece with a 6-inch diameter and internal cooling fins to help control surface heat at the outlet. It’s a clean, high-flow design that balances performance and practicality, delivering audible and measurable gains without triggering issues with emissions compliance. Everything bolts in place using existing factory mounting points, making it a solid choice for DIY installs.

Fitment: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 GM Silverado/Sierra 2500HD/3500HD

Notes:

• Includes all clamps and hardware for installation
• Designed to retain all factory emissions equipment
• DPF-back system is emissions compliant in all states
• Clamp-on system does not require cutting or welding
• Muffler delete design may be too loud for some users
• Polished intercooled tip helps lower surface temps
• Tip features a rolled edge and angle-cut design
• Built from corrosion-resistant 409 stainless steel
• Designed to fit 2007–2023 Silverado and Sierra HD models
• Does not fit cab & chassis or commercial fleet trucks