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Upgrade your GTO headers and keep the rear exhaust
Your 2004 GTO can have Kooks long tube headers while retaining the factory-size rear system. These connection pipes bridge the two, using a 3-inch header inlet and a 2-1/2-inch OEM outlet for the LS1 5.7-litre application.
SKUs: 24113100, 24113200
Choose the catalyst version for your engine
24113100 is the uncatted Competition option.
24113200 has Performance cats for a naturally aspirated engine and is not recommended for forced induction.
The outlet is specific to the 2004 car
The 2-1/2-inch rear interface is the important detail when retaining your OEM-size exhaust. The later LS2 GTO connections use a different outlet, so match the pipe to your model year as well as the headers.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 24113100 | Cat Type: Comp. Only | 3-inch inlet x 2-1/2-inch OEM outlet; uncatted Competition | 2004 LS1 5.7L; Kooks headers; 2-1/2-inch OEM rear connection; Uncatted Competition version |
| 24113200 | Cat Type: Performance Cats | 3-inch inlet x 2-1/2-inch OEM outlet; Performance cats; naturally aspirated only | 2004 LS1 5.7L; Kooks headers; 2-1/2-inch OEM rear connection; Performance cats: naturally aspirated only |
Matching products
These pipes require the GTO long tube headers; for this connection choice, select the 2004 GTO LS1 5.7 application.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2004 | Pontiac GTO Base | 5.7L V8 | 24113100 | 2004 LS1 5.7L; Kooks headers; 2-1/2-inch OEM rear connection |
| 2004 | Pontiac GTO Base | 5.7L V8 | 24113200 | 2004 LS1 5.7L; Kooks headers; 2-1/2-inch OEM rear connection; Performance cats: naturally aspirated only |
Intended use
24113100, 24113200: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 24113100.
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 | 24113100, 24113200 |
| Application | 2004 Pontiac GTO LS1 5.7L |
| Pipe diameters | 3-inch inlet x 2-1/2-inch OEM outlet |
| 24113100 catalyst choice | Uncatted Competition version |
| 24113200 catalyst choice | Performance-catted; naturally aspirated only; not recommended for forced induction |
| Required headers | Kooks long tube headers |
| Material | 304 stainless steel |
Frequently asked questions
Which option is catted?
24113200 is the Performance-catted version for naturally aspirated use. It is not recommended for forced induction.
Can I use these on a 2005 or 2006 GTO?
Choose the separate 2005-2006 LS2 connections for that application. These 2004 LS1 pipes have a 2-1/2-inch OEM rear outlet.
