HSP Diesel Max Flow Bridge / Cold Side / Turbo Inlet for 2011-2016 Chevrolet and GMC LML Duramax
This product is vehicle-specific. Select your year, make, model, engine and transmission to confirm compatibility before adding it to your cart.
Colours and prices as published by HSP Diesel · verified 9/8/2026
Select your truck to continue
Ships directly from the supplier. The final shipping cost will be shown before payment.
- Ships from HSP Diesel
HSP Max Flow Bridge / Cold Side Tube / Turbo Inlet for 2011-2016 Chevrolet / GMC Duramax LML
Part Number: 504-HSP
The 504-HSP is best known as the HSP Max Flow Bridge, Cold Side Tube, and Turbo Inlet Bundle for the 2011-2016 LML Duramax-equipped Chevrolet and GMC trucks. This all-in-one performance bundle transforms airflow and overall efficiency — a must-have for any serious LML owner.
What Is the Max Flow Bridge, Cold Side Tube, and Turbo Inlet Bundle?
The factory LML Duramax intercooler piping severely limits airflow, choking performance. The HSP Max Flow Bundle corrects this by increasing both air volume and velocity, which translates to noticeable power gains and improved engine response.
Max Flow Bridge Benefits
This isnt just any bridge. HSP Diesel engineered the Max Flow Bridge to port-match the intake runners, improving flow and boosting efficiency. The precision build and high-quality finish ensure both performance and durability.
Cold Side Tube Advantages
Factory cold side pipes are restrictive and failure-prone. HSP replaces this with a mandrel-bent aluminum tube that delivers smoother airflow and enhanced reliability. Designed to handle higher boost levels and look sharp while doing it.
Intake Mouthpiece Features
Custom-built and flow-optimized, the included VGT Intake Mouthpiece is hand-fabricated for ideal airflow transition. It ties the entire system together while offering optional powder coat finishes for a polished engine bay.
Whats Included
• 1x Bridge (HSP-IN-223)
• 1x Coldside (HSP-IN-228)
• 1x Fabricated Turbo Inlet (HSP-IN-216-2)
• 1x 1/8'' NPT Brass Plug (RFB-811-RFAB)
• 1x M6x1.0x16mm Flange Bolt (RFB-893-RFAB)
• 1x Duramax Pre-Made Hose - Rubber (RFB-398-RFAB)
• 1x 5/8" Worm Gear Clamp (RFB-403-RFAB)
• 1x 1/2" Worm Gear Clamp (RFB-405-RFAB)
• 60x 5/8" PCV Hose (RFB-407-RFAB)
• 4x 3" T-Bolt Clamp (RFB-422-RFAB)
• 2x 3"x4" Straight Boot (RFB-430-RFAB)
• 1x 3/4" to 5/8" Heater Hose Connector (RFB-462-RFAB)
• 1x 3/8" Coolant Plug - Aluminum (RFB-808-RFAB)
• 1x Rear Cover Coolant Fitting (RFB-809-RFAB)
• 1x Coolant Plug O-Ring (RFB-813-RFAB)
• 2x M6x1.0x25mm Flange Bolt (RFB-896-RFAB)
• 4x M6x1.0x20mm Flange Bolt (RFB-897-RFAB)
Fitment
• LML: 2011-2016 (VIN Code 8) With HSP Intake
Note:
Engine code is dictated by the 8th character of the VIN. The 10th character identifies the model year.
Overview
• Increased performance and spool-up
• Powder coat options to dress up the engine bay
• Upgraded high-strength silicone boots
• Sleek mandrel-bent aluminum tubes replacing factory plastic
• 3.5" to 4" transition for optimal flow
Our Warranty
HSP NO BS LIMITED LIFETIME WARRANTY
At HSP, we believe in our products and back them with our No BS Lifetime Warranty. Weve supported our customers for years — now its official. Below, youll find everything you need to understand the process and guidelines of our hassle-free warranty.
Click here to read the full HSP Warranty
HSP Max Flow Bridge / Cold Side Tube / Turbo Inlet for 2011-2016 Chevrolet / GMC Duramax LML
Part Number: 504-HSP
The 504-HSP is best known as the HSP Max Flow Bridge, Cold Side Tube, and Turbo Inlet Bundle for the 2011-2016 LML Duramax-equipped Chevrolet and GMC trucks. This all-in-one performance bundle transforms airflow and overall efficiency — a must-have for any serious LML owner.
What Is the Max Flow Bridge, Cold Side Tube, and Turbo Inlet Bundle?
The factory LML Duramax intercooler piping severely limits airflow, choking performance. The HSP Max Flow Bundle corrects this by increasing both air volume and velocity, which translates to noticeable power gains and improved engine response.
Max Flow Bridge Benefits
This isnt just any bridge. HSP Diesel engineered the Max Flow Bridge to port-match the intake runners, improving flow and boosting efficiency. The precision build and high-quality finish ensure both performance and durability.
Cold Side Tube Advantages
Factory cold side pipes are restrictive and failure-prone. HSP replaces this with a mandrel-bent aluminum tube that delivers smoother airflow and enhanced reliability. Designed to handle higher boost levels and look sharp while doing it.
Intake Mouthpiece Features
Custom-built and flow-optimized, the included VGT Intake Mouthpiece is hand-fabricated for ideal airflow transition. It ties the entire system together while offering optional powder coat finishes for a polished engine bay.
Whats Included
• 1x Bridge (HSP-IN-223)
• 1x Coldside (HSP-IN-228)
• 1x Fabricated Turbo Inlet (HSP-IN-216-2)
• 1x 1/8'' NPT Brass Plug (RFB-811-RFAB)
• 1x M6x1.0x16mm Flange Bolt (RFB-893-RFAB)
• 1x Duramax Pre-Made Hose - Rubber (RFB-398-RFAB)
• 1x 5/8" Worm Gear Clamp (RFB-403-RFAB)
• 1x 1/2" Worm Gear Clamp (RFB-405-RFAB)
• 60x 5/8" PCV Hose (RFB-407-RFAB)
• 4x 3" T-Bolt Clamp (RFB-422-RFAB)
• 2x 3"x4" Straight Boot (RFB-430-RFAB)
• 1x 3/4" to 5/8" Heater Hose Connector (RFB-462-RFAB)
• 1x 3/8" Coolant Plug - Aluminum (RFB-808-RFAB)
• 1x Rear Cover Coolant Fitting (RFB-809-RFAB)
• 1x Coolant Plug O-Ring (RFB-813-RFAB)
• 2x M6x1.0x25mm Flange Bolt (RFB-896-RFAB)
• 4x M6x1.0x20mm Flange Bolt (RFB-897-RFAB)
Fitment
• LML: 2011-2016 (VIN Code 8) With HSP Intake
Note:
Engine code is dictated by the 8th character of the VIN. The 10th character identifies the model year.
Overview
• Increased performance and spool-up
• Powder coat options to dress up the engine bay
• Upgraded high-strength silicone boots
• Sleek mandrel-bent aluminum tubes replacing factory plastic
• 3.5" to 4" transition for optimal flow
Our Warranty
HSP NO BS LIMITED LIFETIME WARRANTY
At HSP, we believe in our products and back them with our No BS Lifetime Warranty. Weve supported our customers for years — now its official. Below, youll find everything you need to understand the process and guidelines of our hassle-free warranty.
Click here to read the full HSP Warranty
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.