PPE 116120204 High Flow Up-Pipes | 2002-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features:

• 53 percent more flow than stock up-pipes
• Direct bolt-on fit to factory manifolds
• Compatible with 2002–2004 Duramax 6.6L engines
• Made from 11-gauge 304 stainless steel
• Internally sleeved bellows for added durability
• Withstands high temperature and pressure cycles
• Reduces exhaust restriction and improves turbo flow
• Helps lower exhaust gas temperatures (EGTs)
• Ideal for stock or performance Duramax builds
• Reinforced for long-term strength and reliability
• Improves turbo response and engine breathing
• Built to replace known OEM failure points

Say Goodbye To Factory Failures And Hello To Real Power

If your 2002–2004 Duramax has seen some miles, chances are your factory up-pipes are becoming more of a liability than an asset. OEM pipes just weren’t built to handle the constant heat and pressure your diesel engine dishes out, especially if you’re running higher boost or pulling heavy loads. The PPE High Flow Up-Pipes are a direct upgrade that solve this problem before it leaves you stranded. With 53 percent more exhaust flow than stock, these pipes unleash power that’s been held back for years. You’ll notice better turbo response, stronger acceleration, and cooler exhaust temps almost right away. Best part? They bolt right on without any modifications, making installation quick and straightforward. These up-pipes are built tough and built to last, exactly what your hardworking Duramax deserves.

Built With Superior Materials For Long Lasting Performance

The PPE 116120204 High Flow Up-Pipes are engineered for 2002–2004 GM Silverado and Sierra 2500HD/3500HD models with the 6.6L Duramax engine, offering a precise OEM-style fit with serious performance improvements. Crafted from 11-gauge 304 stainless steel, these up-pipes resist cracking and warping under the extreme conditions common in diesel engine bays. Internally sleeved bellows provide additional reinforcement, making them far more durable than the thin-walled factory pipes they replace. Thanks to the increased flow rate, 53 percent more than stock, these pipes improve turbo efficiency and help reduce exhaust backpressure and gas temperatures. This not only protects your turbo from excess strain but also improves overall engine performance, especially under load. Designed as a true bolt-on solution, they integrate seamlessly with factory exhaust manifolds for hassle-free installation. Whether you’re upgrading for towing, tuning, or long-term durability, these pipes are a smart move for any Duramax owner looking for reliable power gains.

Fits: 2002, 2023, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Designed for 2002–2004 GM 6.6L Duramax diesel engines
• Replaces factory up-pipes prone to failure from heat and pressure
• Provides 53 percent more exhaust flow than OEM pipes
• Direct bolt-on installation with factory exhaust manifolds
• Constructed from durable 11-gauge 304 stainless steel
• Includes internally sleeved bellows for added strength
• Engineered to withstand high heat and pressure cycles
• Ideal for both stock and performance-tuned Duramax setups
• Helps lower exhaust gas temperatures and improve turbo efficiency
• Recommended for towing, high-performance, and long-term reliability