PPE 116112520 High Flow Black Exhaust Manifolds & Up-Pipes Package | 2017-2025 Silverado/Sierra 2500HD/3500HD 6.6L

Features:

• High-flow cast iron exhaust manifolds
• 304 stainless steel internally sleeved up-pipes
• Increased inner diameter for better flow
• Lowers exhaust gas temperatures (EGTs)
• Improves turbo spool-up and throttle response
• Optional ceramic coating for heat protection
• Enhances power and fuel efficiency
• Resists corrosion from moisture and road salt
• Designed for long-lasting durability and strength
• Proven performance in high-temp environments
• Direct bolt-on fit with no tuning required

Major Exhaust System Upgrade for GM 6.6L Duramax

If you're building power with your L5P Duramax or just trying to get the most out of your stock setup, the PPE High Flow Exhaust Manifolds & Up-Pipes Package is a serious upgrade worth looking into. Designed for 2017–2025 Silverado and Sierra 2500HD/3500HD trucks with the 6.6L Duramax, this kit is all about increasing exhaust flow, improving efficiency, and keeping EGTs in check—especially under load. The manifolds are cast from high-silicon moly iron, which is a tried-and-true material known for its strength and heat resistance. They’re built to flow better than stock, reducing restriction and helping your turbo spool faster. If you tow heavy, push your truck hard, or just want it to breathe easier, this change alone makes a noticeable difference.

Developed for High-Performance Applications

Paired with the manifolds are PPE’s upgraded up-pipes, which feature internally sleeved bellows made from aircraft-grade 304 stainless steel. These aren't just stronger—they're built with a larger inner diameter to move more exhaust gas with less turbulence. The result is lower exhaust gas temperatures and improved reliability, even during sustained high-load situations like towing up long grades or climbing in hot weather. One of the standout features of this package is the black ceramic coating. Originally developed for military and motorsport applications, ceramic coating provides a thermal barrier that helps keep heat inside the exhaust path, instead of radiating out into the engine bay. That means lower underhood temps, improved thermal efficiency, and added protection against corrosion, moisture, and chemicals. Plus, it keeps the parts looking good for the long haul.

Fits: 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GM 6.6L Duramax