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The Kooks connecting pipes identified by manufacturer part number 14003400 is supplied in the exact configuration described as 3" SS H.O. GREEN Catted OEM Connections. 2020+ F250/F350 Super Duty 7.3L. Confirm the complete part number, application, connection points, emissions requirements, and included components before ordering.
Key Features
- The direct bolt-on design preserves the Super Duty's towing capability up to 21,000 lbs while enhancing throttle response and delivering a deeper V8 rumble without cabin drone.
- Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges and full TIG welds, these pipes ensure zero leaks under high EGTs exceeding 1,600°F and support up to 850 HP from tunes or cams without sacrificing ground clearance or heat management.
- The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation.
- For F-250/F-350 7.3L owners pairing Kooks headers with stock exhaust, the 14003400 GREEN catted connection pipes provide the essential emissions-legal link that maximizes power and reliability for work or play.
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 2020-2022 | Ford | F-250 | Verify engine, emissions equipment, transmission, and exhaust configuration |
| 2020-2022 | Ford | F-350 | Verify engine, emissions equipment, transmission, and exhaust configuration |
Specifications
| Brand | Kooks Headers |
|---|---|
| Manufacturer Part Number | 14003400 |
| Product Type | Connecting Pipes |
| Material | 304 stainless steel |
| Nominal Dimensions | 3 in |
| Fitment Type | Vehicle Specific |
| Manufacturer Detail | Includes all hardware required for installation |
| Manufacturer Detail | Requires Kooks Long Tube Headers |
What's Included
- Includes all hardware required for installation
- Requires Kooks Long Tube Headers
About Kooks Headers
Kooks manufactures performance exhaust components in the United States, including headers, connection pipes, catalytic-converter assemblies, cat-back systems, mufflers, flanges, and installation hardware. Exact part-number verification is essential because similar-looking components can use different engine, chassis, emissions, and connection configurations.
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Frequently Asked Questions
Will this Kooks connecting pipes fit my 2020-2022 Ford F-250?
That year, make, and model range is listed. Confirm the engine, emissions equipment, transmission, body configuration, existing exhaust, and exact Kooks part number before ordering.
Will this connect to the factory exhaust?
Factory connection compatibility depends on the exact part number. Verify collector and outlet size, required Kooks connection pipes, catalytic-converter configuration, and every note in the current Kooks listing.
What should be checked after installation?
Confirm exhaust clearance, hanger alignment, fastener torque, oxygen-sensor wiring, leak-free joints, and adequate distance from fuel lines, brake lines, wiring, and bodywork.
Installation Instructions
- Verify the exact part number, application, emissions configuration, connection sizes, and package contents before disassembly.
- Support the vehicle safely and follow the factory service procedure together with the current Kooks instructions for this part number.
- Test-fit every component before cutting, welding, or permanently tightening the exhaust system.
- Route oxygen-sensor wiring and nearby hoses, lines, and cables away from heat, sharp edges, and moving parts.
- Torque fasteners in the specified sequence, inspect for leaks and clearance, and recheck accessible connections after initial heat cycles.
Connecting Pipes
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Kooks Headers and Exhaust
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