Due to the current high volume of orders, we anticipate that most HSP products will be shipped within 2 to 8 weeks of purchase. However, if you require a more precise lead time, please don’t hesitate to contact us directly.

 

The HSP 103-HSP, commonly known as the HSP Stock Turbo Inlet Horn for the 2001-2004 Duramax-equipped Chevrolet and GMC Trucks, is an essential component that should not be overlooked for the LB7 engine. This HSP Stock Turbo Inlet Horn significantly outperforms the factory-installed one.

 

Now, let’s delve into why you might need an HSP Stock Turbo Inlet Horn for your 2001-2004 Trucks.

 

The stock turbo inlet horn on these trucks falls short in terms of performance. Let’s examine a few reasons why HSP Diesel believes this, and many others do as well. Firstly, the factory turbo inlet horn’s job is to channel air from the intake into the turbocharger. However, it fails to perform adequately. The restrictive design and bends of the factory piece hinder airflow, resulting in poor performance. Additionally, the stock turbo inlet horn is quite plain in appearance, lacking any aesthetic appeal and making it difficult to clean up.

 

In contrast, the HSP Stock Turbo Inlet Horn offers several key differences. Firstly, it significantly improves airflow to the turbocharger, enhancing engine performance. Secondly, its improved design and construction ensure better airflow and reduced restriction. Thirdly, its aesthetically pleasing design allows for easy cleaning and customization.

 

To kickstart the HSP Stock Turbo Inlet Horn, we’ve got a massive 3.5-inch diameter. This is significantly larger than the factory-installed piece. The reason behind this larger size is that a larger turbo inlet horn allows for increased airflow. One of the biggest complaints with the LB7 trucks is that the stock turbo feels constricted. The factory IHI turbo needs to be able to draw in as much air as possible under any circumstances. With the simple addition of the HSP Stock Turbo Inlet Horn, we can jam-pack that stock turbo with so much more air that it can be pushed much further. Many customers have reported power gains without making any other modifications. When combined with the HSP Diesel Cold Air Intake, we noticed a slight reduction in exhaust gas temperatures.

 

Now, let’s talk about what comes with the HSP Stock Turbo Inlet Horn for the LB7:

 

- Turbo Inlet Horn

- (3) M6x1.02x20mm bolts

 

As for compatibility, the HSP Stock Turbo Inlet Horn is designed specifically for LB7 trucks with VIN Code 1. To determine the VIN code, simply look at the 8th character of the VIN number. The 10th character indicates the year of the truck.

 

**Important Note:**

 

Only install the HSP Stock Turbo Inlet Horn with the provided bolts. Do not attempt to install it using factory hardware.

 

Here’s a quick overview of what the HSP Stock Turbo Inlet Horn offers:

 

- Direct replacement for stock applications

- Increased airflow

- Enhanced power output

- Powder coating available for engine bay cleaning

- Extended turbo life

- Quicker turbo spool-up

 

And now, let’s talk about our warranty:

 

HSP No BS Limited Lifetime Warranty

 

At HSP, we stand behind every single product we manufacture. We’ve taken care of almost everything and anything that our customers have encountered over the years, but we didn’t have a formal warranty in place. We’ve always gone above and beyond for our customers, which has set us apart from the competition. We’re committed to maintaining that same standard, but we’re taking it to the next level with our new warranty.