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.
A header upgrade for your manual Mustang GT
Enjoy the 4.6-litre V8 with a purpose-made Kooks long tube header. 11312000 uses 1-5/8-inch primaries and 2-1/2-inch collectors for the listed 2005-2010 Mustang GT 3V application.
SKU: 11312000
The fitting parts and gearbox choice
The 16-gauge 304 stainless headers use 3/8-inch laser-cut round-port flanges with the factory bolt pattern. All header fitting hardware is included. For an automatic installation, add two CAS-109014 O2 extensions, purchased separately. The mandrel-bent primaries retain their shape through the bends, with routing made for the specified installation.
Choose the matching crossover
Use a Kooks X-pipe or H-pipe with 2-1/2-inch header inlets. Professional fitting allows access around the supported engine, K-member and steering shaft, followed by alignment of the complete exhaust.
Tuning for your exhaust upgrade
We recommend tuning with every header installation so the calibration suits your headers, complete exhaust and fuel. Talk to us to discuss tuning for your vehicle and the parts you are fitting.
Matching products
Use the 2-1/2-inch-inlet Mustang GT X-pipe for the 2005-2010 GT 4.6 installation, choosing the 2-1/2-inch header-inlet version to match 11312000.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2005-2010 | Ford Mustang GT | 4.6L V8 | 11312000 | Manual gearbox; automatic fitting requires two separate CAS-109014 extensions; 2-1/2-inch-inlet crossover |
| 2007-2008 | Ford Mustang Shelby GT | 4.6L V8 | 11312000 | Manual gearbox; automatic fitting requires two separate CAS-109014 extensions; 2-1/2-inch-inlet crossover |
| 2008-2009 | Ford Mustang Bullitt | 4.6L V8 | 11312000 | Manual gearbox; automatic fitting requires two separate CAS-109014 extensions; 2-1/2-inch-inlet crossover |
Intended use
11312000: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 11312000.
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 |
|---|---|
| SKU | 11312000 |
| Application | 2005-2010 Mustang GT 4.6L 3V; manual |
| Header primary diameter | 1-5/8-inch |
| Collector diameter | 2-1/2-inch |
| Construction | 16-gauge tubing |
| Flanges | 3/8-inch laser-cut; round ports; factory bolt pattern |
| Included | All header fitting hardware |
| Automatic installation | Two extra CAS-109014 O2 extensions required; purchased separately |
| Required exhaust parts | Matching Kooks X-pipe or H-pipe |
| Primary construction | Mandrel-bent primaries |
| Material | 304 stainless steel |
| Configuration | 11312000; Header Size: 1-5/8" x 2-1/2"; Transmission Type: Manual |
Frequently asked questions
Can this manual version be used on an automatic?
It can, with two additional CAS-109014 O2 extensions purchased separately. The separate automatic header product is also available.
What crossover inlet diameter is required?
Use the matching 2-1/2-inch header-inlet Kooks X-pipe or H-pipe.
