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Keep your GTO rear exhaust and fit long tube headers
These Kooks connections make the front exhaust choice straightforward on your 2005-2006 GTO. Both use a 3-inch header inlet and 3-inch OEM rear outlet, joining matching Kooks long tube headers to your LS2 car’s rear exhaust.
SKUs: 24123100, 24123200
Two catalyst choices
24123100 is the uncatted Competition version.
24123200 uses Performance cats for naturally aspirated use and is not recommended for forced induction.
Made for the later LS2 GTO
The 3-inch OEM rear outlet distinguishes these pipes from the 2004 LS1 version. Fit the header and connection assembly together, with the joints aligned and the O2 wiring clear of the exhaust.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 24123100 | Cat Type: Comp. Only | 3-inch inlet x 3-inch OEM outlet; uncatted Competition | 2005-2006 LS2 6.0L; Kooks headers; 3-inch OEM rear connection; Uncatted Competition version |
| 24123200 | Cat Type: Performance Cats | 3-inch inlet x 3-inch OEM outlet; Performance cats; naturally aspirated only | 2005-2006 LS2 6.0L; Kooks headers; 3-inch OEM rear connection; Performance cats: naturally aspirated only |
Matching products
Use the GTO long tube headers for the 2005-2006 LS2 6.0 installation with these connection pipes.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2005-2006 | Pontiac GTO Base | 6.0L V8 | 24123100 | 2005-2006 LS2 6.0L; Kooks headers; 3-inch OEM rear connection |
| 2005-2006 | Pontiac GTO Base | 6.0L V8 | 24123200 | 2005-2006 LS2 6.0L; Kooks headers; 3-inch OEM rear connection; Performance cats: naturally aspirated only |
Intended use
24123100, 24123200: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 24123100.
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 | 24123100, 24123200 |
| Application | 2005-2006 Pontiac GTO LS2 6.0L |
| Pipe diameters | 3-inch inlet x 3-inch OEM outlet |
| 24123100 catalyst choice | Uncatted Competition version |
| 24123200 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
Are the rear outlets the same on both options?
Yes. Both 24123100 and 24123200 have a 3-inch inlet and 3-inch OEM rear outlet for the 2005-2006 LS2 GTO.
Which version is suitable for a naturally aspirated catted build?
24123200 is the Performance-catted option for naturally aspirated use. It is not recommended for forced induction.
