Fleece FPE-INTAKEHORN Modified Intake Horn | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Features:

• Adds up to 15 horsepower increase
• Proven performance via back-to-back dyno testing
• Direct bolt-on upgrade for LB7 Duramax engines
• Painted black with laser-etched Fleece logo
• Includes new Mahle intake gasket (B32478)
• Improves airflow and intake efficiency
• Simple install with noticeable performance gains
• Ideal for performance builds or stock upgrades
• Durable and stylish powder-coated finish
• One of the best cost-per-horsepower upgrades
• Engineered specifically for 2001–2004 6.6L LB7
• No tuning required for installation

Bolt On Power Without Breaking The Bank

If you’re looking for one of the easiest and most affordable ways to wake up your 2001–2004 LB7 Duramax, the Fleece Modified Intake Horn is a no-brainer. It’s a straightforward bolt-on that delivers a dyno-proven gain of 15 horsepower, no tuning, no drama, just real results. Whether you're building toward bigger performance goals or just want to give your truck a noticeable boost, this upgrade brings power you can feel without emptying your wallet. The black powder-coated finish with the Fleece logo adds a clean, finished look under the hood, showing that performance and style can go hand in hand. It’s ideal for weekend wrenchers who want something effective and easy to install in the driveway. With the included Mahle intake gasket, there’s no hunting around for extra parts. This upgrade proves that sometimes the simplest changes can make the biggest difference in drivability.

Optimized Airflow For Reliable Repeatable Performance Gains

The Fleece FPE-INTAKEHORN Modified Intake Horn is engineered to improve intake efficiency on the 2001–2004 6.6L Duramax LB7 platform. By optimizing the geometry of the intake passage, this upgrade reduces airflow restrictions and improves volumetric efficiency, resulting in measurable gains on the dyno. Back-to-back testing has shown a consistent 15 horsepower increase, making it a reliable and repeatable performance improvement for stock or lightly modified trucks. The unit is constructed to bolt directly in place of the factory intake horn and includes a high-quality Mahle gasket to ensure a secure seal. Its durable black finish helps protect against corrosion and heat, while the sleek Fleece branding adds a subtle performance touch. No tuning is required, making this a plug-and-play solution that integrates easily into your existing setup. Whether you're after more pulling power or quicker throttle response, this intake horn delivers dependable gains with minimal effort.

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

Notes:

• Designed specifically for 2001–2004 GM 6.6L Duramax LB7 engines
• Back-to-back dyno tests show 15 horsepower gain
• No tuning or custom calibration required
• Direct bolt-on installation using factory hardware locations
• Includes new Mahle intake gasket (part number B32478)
• Powder-coated black with a laser-etched Fleece logo
• Ideal for both stock and mildly upgraded LB7 trucks
• Improves intake flow efficiency over factory horn
• One of the most cost-effective horsepower upgrades
• Not compatible with later Duramax engine generations