4 inch XP Series Front Exhaust Pipe with Flange

Features:

• Fits 2001–2004 6.6L Duramax LB7 engines
• 4-inch mandrel bent design
• Constructed from durable 16-gauge steel
• Improves exhaust flow from the turbo
• Helps reduce exhaust gas temperatures
• Enhances throttle response and performance
• Includes heavy-duty flange connection
• Designed for long-lasting durability
• Deepens exhaust tone for a bold sound
• High-temperature coating resists heat and rust
• Perfect upgrade for stock front pipe

Unleash True Flow from Your LB7 Duramax

If you're still running the stock front pipe on your 2001–2004 Silverado or Sierra HD, you're leaving power and efficiency on the table. The MBRP GMS9401 4-inch XP Series Front Exhaust Pipe is designed to open up the flow path straight from the turbo, giving your LB7 Duramax the breathing room it needs to perform at its best. Built from heavy-duty 16-gauge steel and mandrel bent for smooth, unrestricted flow, this upgrade immediately improves throttle response and reduces exhaust gas temperatures. That means your truck runs cooler under load and responds quicker when you step on the pedal. It's a simple yet effective way to get more out of your setup, whether you’re towing, daily driving, or chasing more performance.

Built to Perform, Coated to Last

This pipe doesn’t just sound good on paper—it delivers real-world benefits and holds up in the harshest conditions. The XP Series pipe comes finished in a high-temperature protective coating that fights off rust and corrosion, even in salty or wet environments. You’ll also get a deeper, more aggressive exhaust note that matches the power under the hood without being overbearing in the cab. The flange connection ensures a secure, leak-free fit, and installation is straightforward for anyone comfortable with a wrench. Whether you're upgrading from a restrictive factory pipe or building out a full performance exhaust system, this MBRP front pipe is a solid first step toward better flow, better sound, and better overall performance.

Fits: 2001, 2002, 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7