Fleece Performance Modified LB7 Intake Horn (FPE-INTAKEHORN)

Unlock affordable horsepower from your 2001–2004 GM 6.6L Duramax LB7. The Fleece Performance Modified Intake Horn is a simple yet highly effective bolt-on upgrade that replaces the restrictive factory intake elbow. Back-to-back dyno testing has shown gains of approximately 15 horsepower — one of the cheapest and easiest power upgrades you can make on an LB7.

Key Features & Benefits

• High-flow design — Stock-size inlet with a full 3-inch opening at the turbocharger side for significantly improved airflow
• Cast aluminum construction — Durable, lightweight, and finished in black with the Fleece logo
• Proven performance — Dyno-proven ~15 HP gain with improved throttle response and turbo efficiency
• Easy install — True bolt-on upgrade with no tuning required; many customers complete it in under an hour
• Includes new gasket — Comes with a quality replacement gasket for a clean, leak-free seal

Fitment

• 2001–2004 Chevrolet Silverado / GMC Sierra 2500HD & 3500
• 6.6L Duramax LB7 engines
• Federal emissions trucks only — Not for use on California emissions models

What’s Included

• Fleece Modified LB7 Intake Horn (cast aluminum)
• New mounting gasket

This is an excellent first performance upgrade for LB7 owners looking for noticeable gains without breaking the bank. It pairs especially well with intake air heater deletes, cold air intakes, and exhaust upgrades.