SRF L5P Duramax Intake Horn

Take the restriction out of your L5P intake system with the SRF L5P Duramax Intake Horn, designed and manufactured by Square Root Fabrication with performance and airflow as the priority.

Unlike traditional aluminum intake horns, the SRF L5P Intake Horn is manufactured from high-strength carbon-fiber reinforced nylon. This provides a strong, lightweight intake while also helping isolate the incoming air charge from under-hood heat compared with a highly heat-conductive metal intake horn.

Two Versions Available

4” Intake Horn

Our 4” version is designed for street, performance, towing, and modified L5P applications where increased airflow is desired while maintaining a practical intake size.

4.5” Competition Intake Horn

Built for serious performance applications, the 4.5” version features an oversized inlet designed for competition and high-horsepower L5P combinations where maximum airflow is the priority.

Due to its larger size, the 4.5” version is intended for custom and competition-oriented setups and may require modifications or additional components for proper fitment depending on the vehicle and intake configuration. It should not be considered a direct drop-in replacement for every L5P application.

Features

• Designed for the 6.6L L5P Duramax
• Manufactured from carbon-fiber reinforced nylon
• Available with a 4” or 4.5” inlet
• 4” version designed for street, towing, performance, and modified applications
• 4.5” competition version designed for maximum-airflow, high-horsepower combinations
• Smooth internal transitions designed to reduce restriction and turbulence
• Lightweight and extremely durable construction
• Reduced heat transfer compared with traditional aluminum intake components
• Designed to support increased airflow on modified and high-horsepower L5P combinations
• Designed and manufactured by Square Root Fabrication

From a street-driven L5P to an all-out competition build, SRF gives you an intake horn designed around the airflow demands of your setup.

More airflow. Less restriction. Built the SRF way.