HSP Stock Turbo Inlet Horn for 2001-2004 Duramax Trucks

If you own a 2001-2004 Duramax-equipped Chevrolet or GMC truck, the HSP Stock Turbo Inlet Horn is a must-have upgrade for your LB7. This part is a significant improvement over the factory version, and it’s designed to make your truck run better.

Why Consider the HSP Stock Turbo Inlet Horn?

The stock turbo inlet horn on LB7 trucks leaves a lot to be desired. Many enthusiasts and experts, including those at HSP Diesel, have noted a few key issues. The factory turbo inlet horn struggles to funnel air efficiently from the intake into the turbo. Its restrictive design and awkward bends limit airflow, which can leave your turbo feeling choked. Plus, let’s be honest, the stock piece isn’t exactly eye-catching—it lacks style and can’t be easily cleaned up.

What Makes the HSP Stock Turbo Inlet Horn Stand Out?

The HSP Stock Turbo Inlet Horn boasts a robust 3.5-inch diameter, significantly larger than the factory horn. This increase in size allows for much better airflow. Many LB7 truck owners have reported that their stock turbo feels less restricted and can breathe easier with this upgrade. The factory IHI turbo thrives on airflow, and by adding the HSP Stock Turbo Inlet Horn, you can push your stock turbo to its limits. Customers have even noted power gains without making any other modifications. When paired with the HSP Diesel Cold Air Intake, this upgrade can lead to a noticeable drop in exhaust gas temperatures.

What’s Included with the HSP Stock Turbo Inlet Horn?

• Turbo Inlet Horn
• (3) M6x1.02x20mm bolts

Compatibility of the HSP Stock Turbo Inlet Horn

• Fits LB7: 01-04 VIN Code 1

How to Identify Your VIN Code

Your engine code is found in the 8th character of your VIN number, while the 10th character indicates the year of your truck. This makes it easy to confirm compatibility!

*Important Installation Note*

Please use only the bolts provided with your HSP Stock Turbo Inlet Horn. Avoid using any factory hardware for installation.

Key Features

• Direct replacement for stock applications
• Enhanced airflow
• Increased power output
• Optional powder coating to tidy up your engine bay
• Extended turbo lifespan
• Faster turbo spool-up

Our Warranty

HSP No BS? Limited Lifetime Warranty

At HSP, we take pride in our products and stand behind each one that leaves our facility. For years, we’ve resolved customer issues without a formal warranty in place, going above and beyond to provide exceptional service. Now, we’re taking it a step further with our No BS? warranty. Below, you’ll find clear details about our warranty process and guidelines.