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 (also known as the 103-HSP) is a must-have upgrade. Trust us, this part is a game changer compared to the factory version!

Why Upgrade to the HSP Stock Turbo Inlet Horn?

The stock turbo inlet horn on LB7 trucks leaves a lot to be desired. Many enthusiasts and experts agree that the factory part just doesn’t cut it. Why? Well, the main job of the turbo inlet horn is to channel air from the intake into the turbo, and the factory piece is quite restrictive. Its size and bends limit airflow, making it less efficient. Plus, let’s be honest—it’s not exactly a head-turner. You won’t find any style points here!

What Makes the HSP Stock Turbo Inlet Horn Different?

Let’s talk size! The HSP Stock Turbo Inlet Horn boasts a substantial 3.5-inch diameter, which is a significant upgrade from the factory version. Why does this matter? A larger inlet horn means better airflow. Many LB7 truck owners have complained about their stock turbo feeling choked, and this upgrade is designed to change that. The factory IHI turbo needs all the air it can get, and with the HSP Stock Turbo Inlet Horn, you can feed it much more air than before. Many of our customers have reported noticeable power gains without making any other modifications. When paired with the HSP Diesel Cold Air Intake, users have even seen a slight reduction in exhaust gas temperatures!

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

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

Compatibility: What Does the HSP Stock Turbo Inlet Horn Fit?

• LB7: 2001-2004 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 year of your truck.

*Important Installation Note*

Please use only the bolts that come with the kit. Avoid using any factory hardware for installation.

Key Features of the HSP Stock Turbo Inlet Horn

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

Our Warranty: HSP No BS Limited Lifetime Warranty

We Stand Behind Our Products

At HSP, we believe in the quality of our products and are committed to standing behind every single one that leaves our facility. For years, we've taken care of our customers' needs, addressing any issues that arise. Now, we’re excited to introduce our No BS Limited Lifetime Warranty. This warranty clearly outlines our commitment and the process for any concerns you may have. We’re dedicated to maintaining the high standards that set us apart!