4″ / 5″ Downpipe-Back DPF & CAT Delete Race Exhaust System

For 2017–2019 GM Duramax L5P 2500/3500 – Unlock Raw Power, Sound & Efficiency

🔥 Transform Your Duramax

Give your 2017–2019 GM Duramax L5P 6.6L the upgrade it deserves. Our downpipe-back race exhaust system is built to unleash hidden horsepower, improve fuel economy, and deliver the aggressive sound every diesel owner craves. Whether you tow heavy, daily drive, or just want more throttle response, this exhaust system is engineered for performance without compromise.

📦 Inside the Box

• Heavy-duty SS409 stainless steel downpipe-back race exhaust (built for durability and longevity)
• 1.25″ wide band clamps for a leak-free, secure seal
• Mandrel-bent tubing for unrestricted exhaust flow & maximum performance
• Pre-bent hangers for a factory-like fit
• Muffler option: includes both straight-pipe & muffler sections – you choose your sound
• Aggressive +1″ larger SS304 polished exhaust tip – bold style & finish
• Designed to reuse factory 4-bolt hardware

🚘 Vehicle Fitment

• 2017, 2018, 2019 GM Duramax L5P 2500/3500 (6.6L Diesel)
• Works with: Regular Cab (short & long bed), Crew Cab (short & long bed)
  ⚠️ Not compatible with: Cab & Chassis commercial trucks (fits 4-bolt flange only).

🛠 Built to Last

• Crafted from T-409 stainless steel – resistant to rust & corrosion, perfect for salted winter roads
• Note: Unlike T-304 stainless, T-409 is magnetic. Don’t be fooled during testing – this is still premium stainless steel designed for performance and durability.

⚡ Performance You Can Feel

• Fuel Economy Gains – After DPF/CAT delete, see up to 18–19 MPG combined (results vary with tire size & driving habits)
• Horsepower & Torque Boost – Reduced exhaust restriction means stronger pulls & faster throttle response
• Aggressive Sound Profile – Deep, throaty tone that announces power the moment you hit the throttle

🔧 Easy Installation

• ~1 Hour Install with basic hand tools in your driveway or garage
• Faster with a lift
• Cutting may be required for shorter wheelbase configurations
• Includes all clamps, hangers, and hardware (some factory hardware reused)

⚠️ Race Tuning Required

This system requires special tuning to prevent check engine lights and ensure smooth operation.
✅ Recommended: EZ Lynk Tuning (see our tuning solutions for details).

✅ Why Choose This Exhaust?

• Designed specifically for 2017–2019 Duramax L5P 2500/3500
• Available in 4″ or 5″ options for your power goals
• Bolt-on fitment with minimal modifications
• Built for durability, performance, and fuel efficiency
• Perfect for enthusiasts who want more
•  power, better mileage, and a sound that stands out

👉 Upgrade your Duramax today – Experience the difference in power, sound, and efficiency. Built for diesel owners who demand more.