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Finish your GT500 exhaust the way you want it
Choose a matching crossover for the Kooks headers on your 5.4-litre GT500. This range offers X-pipe and H-pipe layouts with GREEN cats or uncatted Competition Only connections, all using the 2-1/2" OEM rear interface for the 2007-2010 car.
SKUs: 11323100, 11323300, 11323400, 11323600
Choose the layout and cats together
The 3" front pipework is made from 16-gauge 304 stainless steel. GREEN options use 400-cell cats suitable for the supercharged engine; Competition Only options supply the uncatted arrangement.
Keep the rear connection matched
Front fitting clamps are included. The rear outlets join the OEM exhaust using the existing factory clamps, which are not supplied. The 2-1/2" rear size is specific to these earlier GT500 connections.
Choose the sound you enjoy
An X-pipe typically gives a smoother, higher-pitched exhaust note. An H-pipe brings the deeper, classic muscle-car sound. Your choice of cats and rear mufflers also shapes what you hear from your GT500.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 11323100 | Cat Type: Comp. Only; Crossover Type: X Pipe; Outlet Size: 2-1/2" (OEM) | Competition Only X-pipe; front clamps included, OEM rear clamps reused. | Uncatted; competition use |
| 11323300 | Cat Type: GREEN Cats; Crossover Type: X Pipe; Outlet Size: 2-1/2" (OEM) | 400-cell GREEN X-pipe, suitable for forced induction; front clamps included, OEM rear clamps reused. | Match the vehicle and engine rows below |
| 11323400 | Cat Type: Comp. Only; Crossover Type: H Pipe; Outlet Size: 2-1/2" (OEM) | Competition Only H-pipe; front clamps included, OEM rear clamps reused. | Uncatted; competition use |
| 11323600 | Cat Type: GREEN Cats; Crossover Type: H Pipe; Outlet Size: 2-1/2" (OEM) | 400-cell GREEN H-pipe, suitable for forced induction; front clamps included, OEM rear clamps reused. | Match the vehicle and engine rows below |
Matching products
The 2007-2010 GT500 headers supply the matching 3-inch collector interface for your 5.4-litre GT500.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2007-2010 | Ford Mustang Shelby GT500 | 5.4L V8 | 11323100, 11323300, 11323400, 11323600 | |
| 2008-2009 | Ford Mustang Shelby GT500KR | 5.4L V8 | 11323100, 11323300, 11323400, 11323600 |
Intended use
11323100, 11323400: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 11323100, 11323400.
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 | 11323100, 11323300, 11323400, 11323600 |
| Application | 2007-2010 Shelby GT500 5.4L 4V |
| Material | 16-gauge 304 stainless steel |
| Front / OEM outlet | 3" / 2-1/2" |
| Header joint | Ball-and-socket; Kooks long tube headers required |
| GREEN cats | 400-cell; forced-induction suitable |
| Clamps | Front included; rear OEM clamps reused, not included |
Frequently asked questions
Can I choose an H-pipe with GREEN cats?
Yes. 11323600 is the GREEN-catted H-pipe. 11323300 is the GREEN X-pipe.
Are these the same rear size as the 2011-2014 GT500 pipes?
These earlier-car pipes have 2-1/2" OEM outlets. The later GT500 range uses 2-3/4".
