Upgrade Your Duramax with the HSP Stock Turbo Inlet Horn

If you own a 2001-2004 Duramax-equipped Chevrolet or GMC truck, the HSP Stock Turbo Inlet Horn (also known as the 103-HSP) is a must-have upgrade. This part significantly outperforms the factory version, making it a smart choice for your LB7.

Why Choose 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 the team at HSP Diesel, have identified a few key issues with it. First off, the factory turbo inlet horn struggles to funnel air efficiently from the intake to the turbo. Its restrictive design and awkward bends limit airflow, which can hinder performance. Plus, let’s be honest—the stock horn isn’t exactly a showstopper; it lacks visual appeal and can be tough to clean up.

What Makes the HSP Stock Turbo Inlet Horn Stand Out?

The HSP Stock Turbo Inlet Horn boasts a generous 3.5-inch diameter, a significant upgrade from the factory piece. Why does size matter? A larger inlet horn allows for better airflow, which is crucial for the LB7 trucks. Many owners have noted that the stock turbo feels restricted, and this upgrade addresses that concern. With the HSP horn, you can push your stock turbo to its limits by allowing it to consume more air, resulting in noticeable power gains without needing any other modifications. When paired with the HSP Diesel Cold Air Intake, many customers have even reported a drop in exhaust gas temperatures.

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

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

Compatibility Information

• Fits LB7: 01-04 VIN Code 1

How to Identify Your VIN Code

Your engine code is determined by the 8th character of your VIN number, while the 10th character indicates the truck's year.

*Important Installation Note*

Make sure to use only the bolts supplied with your HSP Stock Turbo Inlet Horn. Avoid using any factory hardware for installation.

Key Features

• Direct replacement for stock applications
• Improved airflow
• Enhanced power output
• Optional powder coating for a cleaner engine bay
• Longer turbo lifespan
• Faster turbo spool-up

Our Commitment to You

HSP No BS Limited Lifetime Warranty

At HSP, we take pride in our products and stand firmly behind each one that leaves our facility. For years, we've addressed customer concerns with a commitment to quality service, and now we're excited to introduce our No BS Limited Lifetime Warranty. This warranty outlines our dedication to you and provides clear guidelines and processes for any issues that may arise. We’re here to ensure your experience with us is nothing short of exceptional!