Kooks 3-inch Ultra-GREEN high-flow catted connection pipes for the 2020-2025 Chevrolet Corvette C8 (Stingray, Z06, E-Ray). EPA-compliant GREEN catalytic converters replace the factory mid-section for freer flow while remaining emissions-friendly. Made from T304 stainless steel, handcrafted in the USA and dyno and race tested.
Specifications
| Type | High-flow catted connection pipes (Ultra-GREEN) |
| Material | T304 stainless steel |
| Pipe Diameter | 3 in |
| Configuration | Ultra-GREEN EPA-compliant catalytic converters |
| Origin | Made in the USA |
| Part Number | 21803300 |
| Warranty | Limited lifetime |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2024-2025 | Chevrolet | Corvette | E-Ray |
| 2020-2025 | Chevrolet | Corvette | Stingray |
| 2023-2025 | Chevrolet | Corvette | Z06 |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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