Product Description:
Hawks Motorsports is pleased to offer our clients the 2020+ Chevrolet Corvette C8 6.2L 3" Super Street Ultra-GREEN Catted OEM Connection Pipes, Kooks 21803300. Designed as a replacement for the factory catalytic converters, these 3" stainless steel connection pipes feature flanged inlet and outlet connections with the factory bolt pattern. They connect directly to the OEM manifolds or Kooks Super Street headers on one end and the OEM cat-back exhaust on the other.
If you're looking to wake up the exhaust side of a C8 without turning the car into a full custom exhaust project, this is a pretty serious way to do it. The 3" tubing gives the exhaust system plenty of room to move, while the Ultra-GREEN catalytic converters keep the setup catted instead of simply dumping the factory converters. Bolt these in with the factory-style connections, keep the OEM cat-back in place, and you've got a cleaner-flowing exhaust setup that still makes sense for a street-driven C8.
Kooks builds the connection pipes from 304 stainless steel and uses 3/8"-thick flanges. The Ultra-GREEN catalytic converters feature a stainless steel outer body and a high-capacity metallic substrate. Kooks specifically describes the system as designed for use without a tune.
The 21803300 connection pipes are designed to replace the OEM catalytic converters and connect directly to either the factory manifolds or Kooks Super Street headers. The outlet connects to the OEM cat-back exhaust, making the system compatible with the factory rear exhaust components. Required gaskets and installation hardware are included.
Kooks also reports dyno testing on a Z51-equipped C8 using its Super Street headers and Ultra-GREEN connection pipes. That testing showed an increase of more than 20 horsepower and 26 lb-ft of torque on the stock tune, with no check-engine light during the test. Actual results can vary depending on the vehicle and configuration.
KEY FEATURES
- Manufacturer: Kooks Headers & Exhaust
- Part Number: 21803300
- Application: Chevrolet Corvette C8
- Model Years: 2020+
- Engine: 6.2L V8
- Product Type: Super Street Ultra-GREEN Catted OEM Connection Pipes
- Tube Diameter: 3"
- Material: 304 Stainless Steel
- Flanges: 3/8" thick
- Inlet: OEM manifold or Kooks header connection
- Outlet: OEM cat-back connection
- Bolt Pattern: Stock/OEM
- Catalytic Converters: Ultra-GREEN catted
- Catalytic Converter Substrate: Metallic
- Substrate Diameter: 4-1/2"
- Tune Required: Kooks specifies no tune required
- Gaskets: Included
- Installation Hardware: Included
- OEM Cat-Back: Retained
- Condition: New
- Manufacturer: Kooks Headers & Exhaust
PRODUCT SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | Kooks Headers & Exhaust |
| Part Number | 21803300 |
| Vehicle | Chevrolet Corvette C8 |
| Years | 2020+ |
| Engine | 6.2L V8 |
| Tube Diameter | 3" |
| Material | 304 Stainless Steel |
| Product Type | Super Street Ultra-GREEN Catted Connections |
| Inlet | OEM Manifolds or Kooks Headers |
| Outlet | OEM Cat-Back |
| Bolt Pattern | OEM/Stock |
| Catalytic Converter | Ultra-GREEN |
| Substrate | Metallic |
| Substrate Diameter | 4-1/2" |
| Flange Thickness | 3/8" |
| Tune | No Tune Required per Kooks |
| Gaskets | Included |
| Hardware | Included |
VEHICLE FITMENT / FITS THE FOLLOWING MODELS
2020+ Chevrolet Corvette C8 Stingray
- 6.2L V8
2020+ Chevrolet Corvette C8 E-Ray
- 6.2L V8
Kooks' current product page specifically lists 2020+ C8 Stingray & E-Ray for 21803300.
IMPORTANT Z06 FITMENT NOTE
Do not use 21803300 for the C8 Z06. Kooks' current product page specifically instructs C8 Z06 customers to select part number 218133BK instead.
This exclusion is important and should remain prominent on the Hawks listing.
IMPORTANT APPLICATION NOTES AND EXCLUSIONS
C8 Z06 Exclusion
The Kooks 21803300 is not the correct connection-pipe application for the C8 Z06. Kooks directs Z06 customers to part number 218133BK.
OEM Connections
The inlet uses the stock bolt pattern and connects directly to either the OEM manifolds or Kooks Super Street headers. The outlet connects directly to the OEM cat-back exhaust.
Replaces OEM Catalytic Converters
The 21803300 replaces the factory catalytic converters while maintaining a catted exhaust configuration.
No Tune Required
Kooks specifically identifies the Ultra-GREEN catalytic converter configuration as designed to be used with no tune required.
California / CARB Restriction
Kooks' original C8 Super Street documentation states that these products are not legal for sale, installation or use on licensed vehicles in California and do not meet CARB compliance. Current retailers also identify California/CARB restrictions for this product.
INSTALLATION NOTES
- Verify the vehicle is an applicable C8 Corvette before ordering.
- Do not use this SKU for the C8 Z06.
- Verify the factory manifold or Kooks header connection before installation.
- The connection pipes use the OEM-style bolt pattern.
- The outlet connects to the OEM cat-back exhaust.
- Required gaskets and installation hardware are included.
- Follow the current Kooks installation instructions.
- Inspect all flange surfaces before installation.
- Verify proper clearance around the connection pipes and catalytic converters.
- Check all connections for exhaust leaks after installation.
- Follow applicable emissions and inspection requirements for the vehicle's location.
FREQUENTLY ASKED QUESTIONS
What Corvette does Kooks 21803300 fit?
Kooks lists 21803300 for the 2020+ Chevrolet Corvette C8 Stingray and E-Ray.
What engine does this fit?
The application is for the C8's 6.2L V8.
What size are the connection pipes?
The Kooks 21803300 uses 3" stainless steel tubing.
Does it replace the factory catalytic converters?
Yes. The 21803300 is designed to replace the OEM catalytic converters.
Can these connect to the factory manifolds?
Yes. The inlet connects directly to the OEM manifolds or Kooks Super Street headers.
Will they connect to the factory cat-back?
Yes. The outlet is designed to connect directly to the OEM cat-back exhaust.
Are the catalytic converters included?
Yes. The 21803300 includes Kooks Ultra-GREEN catted connection pipes.
Is a tune required?
Kooks states that the Ultra-GREEN connection pipes are designed for use with no tune required.
Is this the correct part for a C8 Z06?
No. Kooks specifically directs C8 Z06 customers to 218133BK rather than 21803300.
Are gaskets and hardware included?
Yes. Kooks states that the required gaskets and installation hardware are included.
What are the catalytic converters made from?
Kooks identifies the Ultra-GREEN cats as having a 304 stainless steel outer body and a high-capacity metallic substrate.
***Kooks is a built to order manufacturer and their focus is providing the best quality parts available. While their typical lead time is 4-6 weeks, some products may take up to 12 weeks to produce.***
