HSP Diesel Stock Turbo Inlet Horn for 2001-2004 Chevrolet And GMC LB7 Duramax
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Colours and prices as published by HSP Diesel · verified 9/8/2026
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HSP Stock Turbo Inlet Horn for 2001-2004 Chevrolet / GMC Duramax LB7 The 103-HSP, also known as the HSP Stock Turbo Inlet Horn, is designed for the 2001-2004 LB7 Duramax-equipped Chevrolet and GMC trucks. This is a highly effective upgrade over the restrictive factory component and a must-have for anyone looking to improve airflow and overall performance. Why You Need the HSP Stock Turbo Inlet Horn The factory turbo inlet horn on LB7 trucks is poorly designed and highly restrictive. Its small diameter and awkward bends limit airflow to the turbocharger, choking its performance. This component also offers no visual appeal or performance benefit under the hood. HSP Diesel recognized the need for improvement—and delivered. What Makes the HSP Stock Turbo Inlet Horn Different? HSPs version features a massive 3.5" diameter—far superior to the OEM part. The larger, smoother interior increases airflow and reduces restrictions. This allows the stock IHI turbocharger to spool faster and breathe easier, which translates into improved power and torque. Many customers report noticeable gains with just this part alone, and when paired with the HSP Cold Air Intake, it can help lower exhaust gas temperatures (EGTs). Whats Included 1x Max Flow Inlet Horn (HSP-IN-235) 1x LB7 Turbo Inlet O-Ring (RFB-819-RFAB) 3x M6x1.0x20mm Button Head Screws (RFB-908-RFAB) Fitment LB7: 2001-2004 (VIN Code 1) How to identify the VIN code: The 8th character of the VIN indicates engine type, while the 10th character identifies the model year. Special
Note:
Only install this part using the supplied bolts. Do NOT attempt to install with factory hardware. Overview Direct replacement for factory applications Significantly increased airflow Improved horsepower and torque Faster turbo spool-up Extended turbo life Powder coating options available for a cleaner engine bay Our Warranty HSP NO BS LIMITED LIFETIME WARRANTY At HSP, we believe in our products and stand firmly behind every one we manufacture. For years weve supported our customers with unmatched service—even without a formal policy. Now, with our No BS Lifetime Warranty, you can count on a clear process and a commitment that lives up to its name. For more information about our Lifetime No BS Warranty, click HERE.
HSP Stock Turbo Inlet Horn for 2001-2004 Chevrolet / GMC Duramax LB7 The 103-HSP, also known as the HSP Stock Turbo Inlet Horn, is designed for the 2001-2004 LB7 Duramax-equipped Chevrolet and GMC trucks. This is a highly effective upgrade over the restrictive factory component and a must-have for anyone looking to improve airflow and overall performance. Why You Need the HSP Stock Turbo Inlet Horn The factory turbo inlet horn on LB7 trucks is poorly designed and highly restrictive. Its small diameter and awkward bends limit airflow to the turbocharger, choking its performance. This component also offers no visual appeal or performance benefit under the hood. HSP Diesel recognized the need for improvement—and delivered. What Makes the HSP Stock Turbo Inlet Horn Different? HSPs version features a massive 3.5" diameter—far superior to the OEM part. The larger, smoother interior increases airflow and reduces restrictions. This allows the stock IHI turbocharger to spool faster and breathe easier, which translates into improved power and torque. Many customers report noticeable gains with just this part alone, and when paired with the HSP Cold Air Intake, it can help lower exhaust gas temperatures (EGTs). Whats Included 1x Max Flow Inlet Horn (HSP-IN-235) 1x LB7 Turbo Inlet O-Ring (RFB-819-RFAB) 3x M6x1.0x20mm Button Head Screws (RFB-908-RFAB) Fitment LB7: 2001-2004 (VIN Code 1) How to identify the VIN code: The 8th character of the VIN indicates engine type, while the 10th character identifies the model year. Special
Note:
Only install this part using the supplied bolts. Do NOT attempt to install with factory hardware. Overview Direct replacement for factory applications Significantly increased airflow Improved horsepower and torque Faster turbo spool-up Extended turbo life Powder coating options available for a cleaner engine bay Our Warranty HSP NO BS LIMITED LIFETIME WARRANTY At HSP, we believe in our products and stand firmly behind every one we manufacture. For years weve supported our customers with unmatched service—even without a formal policy. Now, with our No BS Lifetime Warranty, you can count on a clear process and a commitment that lives up to its name. For more information about our Lifetime No BS Warranty, click HERE.
HSP offers a limited lifetime warranty to the original purchaser on eligible HSP products. Underhood powder coating has separate two-year limited coverage. Non-HSP brands follow their own manufacturer warranties. Discontinued products and customer/installer damage are excluded. Claim authorization is required; customer pays inbound shipping for ordinary claims.
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
HSP Diesel warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what HSP Diesel offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
Professional installation is recommended.
- Return eligibility
- HSP states returns must be postmarked within 30 days of purchase, new and unused with original tags and packaging, with an approved RMA. A 15% restocking fee and customer-paid return shipping apply. Special orders, non-HSP dropship products, apparel, used items and custom colors are excluded. Based on what HSP Diesel offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- HSP Diesel
- Warranty duration
- Product-specific duration not stated; see supplier terms
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- HSP Diesel
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.