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Finish your C6 header upgrade with the matching revised X-pipe
Connect revised Kooks TORCA-clamp headers to the 2-1/2" OEM rear exhaust on your 2009-2013 LS3 Corvette. These three-piece X-pipes offer Competition Only, Performance or GREEN cats, with the mid-pipes and installation clamps included.
SKUs: 21603111, 21603211, 21603311
Match the header joint, not just the year
These are the TORCA Swivel-Seal revision. They require the revised Kooks headers and do not join the older two-bolt-flange headers. That joint style is the first thing to check when adding an X-pipe to an existing Kooks installation.
A crossover with the rear transitions supplied
The 3" X-pipe includes 3" to 2-1/2" mid-pipes for the OEM-style rear exhaust and all necessary installation clamps. GREEN supports forced induction; Performance is for naturally aspirated use. Competition Only supplies the uncatted competition arrangement.
The GREEN catalysts in 21603311 are rated for up to 750 wheel horsepower.
Choose your configuration
| SKU | Configuration | Supplied arrangement | Fitting / engine conditions |
|---|---|---|---|
| 21603111 | Model Year: 2009-2013; Cat Type: Comp. Only | Competition Only connection assembly; 3" to 2-1/2" mid-pipes and necessary clamps included | Revised Kooks TORCA Swivel-Seal headers only; Uncatted; competition use |
| 21603211 | Model Year: 2009-2013; Cat Type: Performance Cats | Performance Cats connection assembly; 3" to 2-1/2" mid-pipes and necessary clamps included | Revised Kooks TORCA Swivel-Seal headers only; Naturally aspirated only |
| 21603311 | Model Year: 2009-2013; Cat Type: GREEN Cats | GREEN Cats connection assembly; 3" to 2-1/2" mid-pipes and necessary clamps included; GREEN catalysts rated up to 750 wheel horsepower | Revised Kooks TORCA Swivel-Seal headers only |
Matching products
The revised C6 TORCA headers provide the matching Swivel-Seal joint. Choose the X-pipe year range for your own LS2 or LS3 Corvette.
Vehicle fitment
| Years | Vehicle / trim | Engine | Applicable SKU | Fitting conditions |
|---|---|---|---|---|
| 2009-2013 | Chevrolet Corvette Base | 6.2L V8 | 21603111, 21603211, 21603311 | Revised Kooks TORCA Swivel-Seal headers only |
| 2010-2013 | Chevrolet Corvette Grand Sport | 6.2L V8 | 21603111, 21603211, 21603311 | Revised Kooks TORCA Swivel-Seal headers only |
Intended use
21603111, 21603211: Competition, off-road and track use only. Not for use on public roads.
The competition-use waiver applies to 21603111.
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 | 21603111, 21603211, 21603311 |
| Applications | 2009-2013 C6 LS3 6.2L |
| Material | 304 stainless steel |
| Header interface | TORCA Swivel-Seal; revised Kooks headers only |
| X-section | Three piece; 3" pipework |
| Included rear transitions | 3" to 2-1/2" mid-pipes |
| Rear outlet | 2-1/2" OEM-style exhaust |
| Clamps | All necessary installation clamps included |
| Choices | Competition Only; Performance; GREEN |
| Performance condition | Naturally aspirated only |
| Excluded front interfaces | OEM manifolds/cats and old two-bolt Kooks header flanges |
| 21603311 catalyst rating | Up to 750 wheel horsepower |
Frequently asked questions
Will it fit my older two-bolt Kooks headers?
Choose an X-pipe matched to that older joint. This listing is the revised TORCA Swivel-Seal arrangement.
Are the rear mid-pipes and clamps included?
Yes. The 3" to 2-1/2" mid-pipes and necessary clamps are included.
Can it fit under factory manifolds?
These X-pipes require the revised Kooks headers.
