Stainless Works 2020-21 Silverado HD 6.6L 2in Long Tube Header Kit Factory Connect (part # CT220HCATY), built from 304 stainless steel by Stainless Works in Streetsboro, Ohio.
304 Stainless Steel
TIG Welded
2020–23 Silverado HD 2500/3500
Long Tube Headers
1-7/8" or 2"
Made in USA
Overview
Upgrade your 2020–23 Chevy Silverado or GMC Sierra HD 2500/3500 with premium long tube headers from Stainless Works. Unleash that 6.6L gas motor with 1-7/8" or 2" primaries that flow into a 3" collector with an integrated merge spike. This system comes with high-flow catalytic converters and your choice of either a Y-pipe or X-pipe for a simple bolt-on install.
Out of the box this system fits the 2500/3500 6.6L gas motor in both 2WD and 4WD. It fits all cab and bed configurations and can connect to the stock exhaust or Stainless Works Legend or Redline catback systems for a true dual exhaust.
Built from corrosion-resistant 304 stainless steel and fully TIG welded for strength and durability at our state-of-the-art facility in Streetsboro, Ohio — engineered for long-term performance.
Why Stainless Works
- American-made from raw material to finished product
- TIG welded by skilled craftsmen for strength and beauty
- Lifetime warranty on material and craftsmanship
- Direct bolt-on fit for 2020–23 Silverado/Sierra HD 6.6L
- Available with Y-pipe or X-pipe configuration
Key Features
1-7/8" or 2" Primary Tubes
Choose the primary size that best matches your build.
3" Collectors
Integrated merge spikes improve exhaust scavenging and performance.
High-Flow Catalytic Converters
EPA compliance with improved flow for maximum performance.
Y-Pipe or X-Pipe
Choose your preferred crossover for optimal flow and tone.
Mandrel Bent Tubing
Smooth airflow with zero restriction bends.
TIG Welded Construction
Precision welds for maximum durability.
Specifications
| Vehicle Fitment |
2020–23 Chevy Silverado / GMC Sierra HD 2500/3500 6.6L Gas |
| System Type |
Long Tube Header Kit |
| Primary Tube Size |
1-7/8" or 2" |
| Collector Size |
3" with Integrated Merge Spike |
| Catalytic Converters |
EPA Compliant High-Flow |
| Connection Options |
Stock Exhaust — or — Stainless Works Legend/Redline Catback |
| Transmission Compatibility |
6-Speed Transmission Only |
| Drivetrain |
2WD & 4WD |
| Cab/Bed Compatibility |
All Cab & Bed Configurations |
| Material |
304 Stainless Steel |
| Welding |
TIG Welded |
| Warranty |
Lifetime |
| Origin |
Made in USA — Streetsboro, Ohio |
Fitment Information
⚠️ IMPORTANT FITMENT NOTE
This system only fits 6-speed transmission models. Please verify your transmission type before ordering.
This header system fits the 2020–23 Chevy Silverado / GMC Sierra HD 2500/3500 6.6L gas motor in the following configurations:
Vehicle Compatibility
✓ 2020–23 Silverado HD 2500/3500 6.6L
✓ 2020–23 Sierra HD 2500/3500 6.6L
✓ 2WD & 4WD Models
✓ All Cab & Bed Configurations
Not Compatible
✗ 10-Speed Transmission Models
*Only fits 6-speed transmission
⇩ Download Installation Instructions (PDF)
What's In The Box
- Driver & Passenger Side Headers x2
- Catted Leads x2
- Y-Pipe or X-Pipe
- Band Clamps x4
- Bolt Kit — 16 Pieces
- RTV Tube
- O2 Extensions x3
- Donut Gasket
- Bolts x2
- Washers x4
- Lock Washers x2
- Nuts x2
- Installation Instructions
Frequently Asked Questions
Will these headers fit my 2020–23 Silverado or Sierra HD 2500/3500?
Yes. These long tube headers are designed specifically for the 2020–2023 Chevy Silverado and GMC Sierra HD 2500/3500 with the 6.6L gas motor. They fit 2WD and 4WD models in all cab and bed configurations. Please verify that your vehicle has a 6-speed transmission before ordering.
What primary tube sizes are available?
You can choose between 1-7/8" or 2" primary tubes. Both options feature 3" collectors with integrated merge spikes and high-flow catalytic converters.
What is the transmission compatibility?
This system is designed for 6-speed transmission models only. It will not fit 10-speed transmission models. Please verify your transmission type before ordering.
What warranty is included?
Stainless Works provides a lifetime warranty on material and craftsmanship — covering the full life of the product, not just a limited term.
Questions? Call us at | Mon–Fri 7:30am–4:30pm EST
Built To Order in 4 Weeks — Free Shipping on Orders $50+
This Listing
- Brand: Stainless Works
- Part number: CT220HCATY
- Product type: Headers
- Fitment: 2020-21 Silverado HD 6.6L
- Configuration: 2, High-Flow Cats, Stock Exhaust (Factory Connect)
- EPA status: Testing
- Shipping weight: 55 lb
California Prop 65 warning applies to this product.
Emissions note: headers, downpipes and catless/high-flow pipes may not be legal for street use in all states. Check your local emissions laws before installing.
Fitment note: Stainless Works systems are application-specific (year, cab/bed, transmission and factory exhaust). Send us your VIN before ordering and we will confirm fitment: 954-507-6261 or sales@americanmuscleperformance.net.
