6.6L Duramax L5P High-Flow Y-Bridge | 3.5-inch | Chevy & GMC | 2017–2024
Type: exhaust-component
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Building a custom turbo setup for your 6.6L Duramax L5P? This 3.5" stainless steel Y-bridge is designed for modified 2017–2024 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks running a compatible aftermarket turbo configuration.
Built from TIG-welded stainless steel, the Y-bridge features a 3.5" bead-rolled inlet, a factory MAP sensor connection, and a 1/8" NPT accessory port. It mounts to the original intake runners but requires compatible aftermarket charge piping and custom fabrication to complete the installation.
Important: This is not a direct-fit replacement for the factory Y-bridge. It is not compatible with the stock turbocharger or original intercooler piping.
Overview
When you're putting together a custom turbo system on the 6.6L Duramax L5P, the intake connections need to match the rest of your setup. This 3.5" Y-bridge provides a connection point for compatible aftermarket charge-air piping while retaining the original intake-runner mounting arrangement.
The bridge is constructed from TIG-welded stainless steel and features a bead-rolled inlet to help secure a properly sized silicone coupler. It also includes a provision for the factory MAP sensor and a 1/8" NPT port for a compatible fitting or accessory.
Unlike a stock replacement, this Y-bridge is intended for custom performance builds. The installer must provide compatible turbo and charge-pipe components and complete any fabrication required for the specific setup.
Vehicle Fitment
| Year Range | Make | Model | Engine | Requirements |
|---|---|---|---|---|
| 2017–2024 | Chevrolet | Silverado 2500HD / 3500HD | 6.6L Duramax L5P | Compatible Custom Turbo Setup |
| 2017–2024 | GMC | Sierra 2500HD / 3500HD | 6.6L Duramax L5P | Compatible Custom Turbo Setup |
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Important Fitment Notes:
- Designed for 2017–2024 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax L5P engine.
- Requires a compatible aftermarket turbocharger configuration.
- Not compatible with the factory turbocharger setup.
- Not compatible with original intercooler piping.
- Mounts to the factory intake runners using the original hardware and seals.
- Custom charge piping and fabrication are required.
- Confirm your turbo and charge-air configuration before ordering.
What's In The Box
- 3.5" TIG-welded stainless steel Y-bridge
- Integrated factory MAP sensor provision
- Integrated 1/8" NPT accessory port
Note: This listing is for the Y-bridge assembly. Aftermarket turbo components, charge piping, silicone couplers, clamps, and fabrication materials are not specified as included.
The Y-bridge reuses the original intake-runner hardware and seals.
Technical Specifications
| Product Type | High-Flow Y-Bridge |
| Engine | 6.6L Duramax L5P Diesel |
| Vehicle Fitment | 2017–2024 Silverado / Sierra 2500HD & 3500HD |
| Material | TIG-Welded 304 Stainless Steel |
| Inlet Diameter | 3.5" |
| Inlet Design | Bead-Rolled |
| MAP Sensor Connection | Factory MAP Sensor Provision |
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
