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The Kooks headers & manifolds identified by manufacturer part number 1151H432 is supplied in the exact configuration described as 1-7/8" Stainless Headers & GREEN Catted Conn. Kit. 2015-2026 Mustang GT/D.H.. Confirm the complete part number, application, connection points, emissions requirements, and included components before ordering.
Key Features
- The significant changes in exhaust flow affect air fuel ratios and require ECM recalibration to achieve optimal power output and safe operation.
- Catted versions with Kooks GREEN or high flow catalytic converters comply with federal emissions standards but are not CARB certified for California.
- Catted connection pipe versions include replacement high flow cats.
- Most Kooks connection pipe kits are designed to mate with the factory cat back exhaust inlet diameter.
- Long tube headers replace the factory exhaust manifolds and generally require removal of the factory catalytic converters.
- Tight engine bay clearances on some platforms can increase install time.
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 2015-2026 | Ford | Mustang | Verify engine, emissions equipment, transmission, and exhaust configuration |
Specifications
| Brand | Kooks Headers |
|---|---|
| Manufacturer Part Number | 1151H432 |
| Product Type | Headers & Manifolds |
| Material | 304 stainless steel |
| Nominal Dimensions | 1-7/8 in |
| Fitment Type | Vehicle Specific |
| Manufacturer Detail | Dual Bolt Pattern Header Flange |
| Manufacturer Detail | Kooks GREEN Cats EPA verified 400 Cell High Flow Catalytic Converters |
| Manufacturer Detail | Kooks GREEN Cats are engineered to perform in Modern Muscle cars up to 750 RWHP |
| Manufacturer Detail | Includes Gaskets, Oxygen Sensor Extension Harness, Clamps and Bolt Kit required for Installation |
What's Included
- Kooks GREEN Cats are engineered to perform in Modern Muscle cars up to 750 RWHP
- Includes Gaskets, Oxygen Sensor Extension Harness, Clamps and Bolt Kit required for Installation
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.
Related Kooks Headers Products
- Shop Kooks Headers
- Kooks 1151H631 2 in. Headers and GREEN Connection Kit 2015-2023 Ford Mustang GT 5.0L 4V
- Kooks 1361H430 1 7/8 in. Headers and GREEN Connection Kit 2015-2020 Ford F-150 5.0L Coyote V8
- Kooks 15-26 Mustang GT/DH 5.0L 4V 1-7/8 x3 SS Headers w/Ultra Green Catted Conn Pipe/w OEM Adapters
Frequently Asked Questions
Will this Kooks headers & manifolds fit my 2015-2026 Ford Mustang?
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.
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