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.
Choose the exhaust character you want for your Mustang
Give your 4.6-litre Mustang a matched Kooks long tube header kit with the crossover and catalysts that suit your build. Choose an X-pipe or H-pipe with Performance or GREEN cats, all paired with 1-5/8" headers and the 2-1/2" OEM rear connection.
SKUs: 1131H020, 1131H030, 1131H050, 1131H060
Choose an X-pipe or H-pipe
An X-pipe merges the exhaust streams; an H-pipe uses a balance tube between the banks. An X generally favours a smoother, higher-pitched character and an H a deeper tone. Your rear mufflers and the rest of the system also shape the sound.
Made for manual and automatic cars
Both transmission layouts are supported. The headers and crossover use 16-gauge 304 stainless steel, with mandrel-bent primaries, 3/8" laser-cut flanges and the stock bolt pattern. Necessary installation hardware is included.
Match the catalysts to your modifications
Performance cats suit naturally aspirated engines. GREEN is suitable for forced induction. Both catalyst choices use a 400-cell specification on these exact kits, but the engine-use distinction still matters when choosing the package.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 1131H020 | Cat Type: Performance Cats; Crossover Type: X Pipe | Headers; Performance Cats X-pipe; Necessary installation hardware included | Naturally aspirated only |
| 1131H030 | Cat Type: GREEN Cats; Crossover Type: X Pipe | Headers; GREEN Cats X-pipe; Necessary installation hardware included | Use the SKU-specific vehicle rows below |
| 1131H050 | Cat Type: Performance Cats; Crossover Type: H Pipe | Headers; Performance Cats H-pipe; Necessary installation hardware included | Naturally aspirated only |
| 1131H060 | Cat Type: GREEN Cats; Crossover Type: H Pipe | Headers; GREEN Cats H-pipe; Necessary installation hardware included | Use the SKU-specific vehicle rows below |
Tuning for your exhaust upgrade
We recommend tuning with every header installation so the calibration suits your new headers, complete exhaust and fuel. Contact us to discuss the right tuning route for your vehicle.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2005-2010 | Ford Mustang GT | 4.6L V8 | 1131H020, 1131H030, 1131H050, 1131H060 | |
| 2007-2008 | Ford Mustang Shelby GT | 4.6L V8 | 1131H020, 1131H030, 1131H050, 1131H060 | |
| 2008-2009 | Ford Mustang Bullitt | 4.6L V8 | 1131H020, 1131H030, 1131H050, 1131H060 |
Intended use
1131H020, 1131H050: 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 | 1131H020, 1131H030, 1131H050, 1131H060 |
| Application | Listed 2005-2010 Mustang 4.6L 3V applications |
| Transmissions | Manual or automatic |
| Material | 16-gauge 304 stainless steel |
| Headers | 1-5/8" primaries; 2-1/2" collectors |
| Flanges | 3/8" laser-cut; stock bolt pattern |
| Crossover / rear outlet | 2-1/2" X or H-pipe; 2-1/2" OEM outlets |
| Catalysts | Performance or GREEN; 400-cell specification |
| Included | Headers, selected crossover and necessary installation hardware |
| Performance condition | Naturally aspirated only |
Frequently asked questions
Can I choose either crossover with GREEN cats?
Yes. Both GREEN X-pipe and GREEN H-pipe kits are available.
Will this fit an automatic Mustang?
Yes, for the listed engine, trim and year applications.
Are the rear mufflers part of the kit?
The package joins the OEM rear interface, retaining a compatible rear exhaust.
