Know the landed cost before you order
Prices include VAT. Shipping is charged separately and calculated at checkout for your destination. If no shipping option is shown, contact us for a quote before ordering.
Give your Mustang a front exhaust upgrade to match your plans
Choose a Kooks long tube header kit with Performance or GREEN catted connections for the supported 5.0-litre Mustang applications. Both packages include OEM adapters and fitting parts, letting you keep a compatible rear exhaust while upgrading the front system.
SKUs: 1151H422, 1151H432
Choose the catalyst for your Coyote
Performance cats are for naturally aspirated engines. GREEN supports forced induction and is paired here with 1-7/8" primaries. Both kits use 3" collectors, 3/8" laser-cut flanges and a dual bolt-pattern header flange.
The GREEN catalysts in 1151H432 are rated for up to 750 RWHP.
Fitting parts are part of the package
Gaskets, the oxygen-sensor extension harness, clamps and bolt kit are included, along with OEM adapters. That brings the principal header conversion components together in one purchase. GT, Bullitt, Mach 1 and Dark Horse years remain separate in the fitment table.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 1151H422 | Cat Type: Performance Cats | Headers; Performance Cats front connections; OEM adapters, gaskets, O2 extension harness, clamps and bolt kit included | Naturally aspirated only |
| 1151H432 | Header Size: 1-7/8"; Cat Type: GREEN Cats | 1-7/8" headers; GREEN Cats front connections; OEM adapters, gaskets, O2 extension harness, clamps and bolt kit included; GREEN catalysts rated up to 750 RWHP | Use the SKU-specific vehicle rows below |
Tuning for your exhaust upgrade
We recommend tuning with the header installation. The 2015-2017 Mustang GT custom tuning listing covers those GT years. For later GT cars, Bullitt, Mach 1 or Dark Horse, contact us about calibration for the complete header setup.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2015-2026 | Ford Mustang GT | 5.0L V8 | 1151H422, 1151H432 | |
| 2015-2026 | Ford Mustang GT Premium | 5.0L V8 | 1151H422, 1151H432 | |
| 2019-2020 | Ford Mustang Bullitt | 5.0L V8 | 1151H422, 1151H432 | |
| 2021-2023 | Ford Mustang Mach 1 | 5.0L V8 | 1151H422, 1151H432 | |
| 2024-2026 | Ford Mustang Dark Horse | 5.0L V8 | 1151H422, 1151H432 | |
| 2024-2026 | Ford Mustang Dark Horse Premium | 5.0L V8 | 1151H422, 1151H432 |
Intended use
1151H422: Competition, off-road and track use only. Not for use on public roads.
Ordering and delivery
Estimated lead time is 4-6 weeks. Delivery may be faster depending on stock levels. Shipping is charged separately.
Technical specifications
| Specification | Details |
|---|---|
| SKUs | 1151H422, 1151H432 |
| Applications | Listed Mustang 5.0 GT / GT Premium / Bullitt / Mach 1 / Dark Horse trims and years |
| Material | 304 stainless steel |
| Collectors | 3" with Kooks scavenging spike |
| Flanges | 3/8" laser-cut; dual bolt-pattern header flange |
| GREEN primary tubing | 1-7/8" on 1151H432 |
| Catalysts | Performance or GREEN; both exact pages specify 400-cell cats |
| Included | Headers, selected connections, OEM adapters, gaskets, O2 extension harness, clamps and bolt kit |
| Performance condition | Naturally aspirated only |
| 1151H432 catalyst rating | Up to 750 RWHP |
Frequently asked questions
Which kit should I choose for a supercharger?
Choose the GREEN-catted 1151H432 from these two packages.
Do I need to buy OEM adapters separately?
No. OEM adapters are included with both kits.
