Kooks 218133BK Ultra-GREEN Catted Connections for C8 Corvette Z06
Build your 2023–2027 C8 Corvette Z06 exhaust around the Kooks 218133BK Ultra-GREEN cats with heat blankets. This matched pair replaces the original catalytic-converter section on the 5.5L LT6, using 3-inch 304 stainless steel tubing and 5-inch catalyst bodies. The stock-pattern flanges connect to OEM manifolds or Kooks headers at the inlet and the OEM cat-back at the outlet.
With the factory cat-back retained, your Z06 keeps its rear mufflers and exhaust-tip arrangement while the catalytic-converter connections ahead of them are replaced. Both connections are supplied with matching heat blankets for a complete catalyst-and-blanket installation. The overall exhaust character still depends on the manifolds or headers and rear exhaust you use, so discuss your sound goals with your installer before choosing the combination.
Product Details
- Kit identity: Kooks 218133BK, supplied as a catted connection pair with heat blankets
- Construction: 304 stainless steel with 3-inch connection tubing
- Catalyst size: 5-inch-bodied Ultra-GREEN catalysts; 5 inches describes the catalyst bodies, not the pipe or exhaust tips
- Attachment: Flanged inlet and outlet using the stock bolt pattern
- Included pieces: Both catted connections, Kooks 218133B2 heat blankets, and the required gasket and bolt kit
- Exhaust location: Between the OEM manifolds or Kooks headers and the OEM cat-back
Benefits
- Keep your rear-exhaust plan: The OEM cat-back connection lets you select this catalyst kit while retaining the factory rear mufflers and tips.
- Buy the matched blanket package: The supplied 218133B2 blankets belong with these catted connections, avoiding a separate blanket-only purchase when you need the complete kit.
- Choose for the LT6 Z06: Clear engine, year and interface details help distinguish this order from generic C8 cats or a full header-and-catalyst package.
Important Notes
- Check modified exhaust combinations: Provide the make and part number of any existing headers or rear exhaust. OEM-style flanges do not establish compatibility with every aftermarket component.
- Plan professional installation: Have your installer verify access, oxygen-sensor placement and blanket installation for your Z06.
- Confirm calibration and your goals: Check tune requirements and warning-light expectations for your exact setup. Sound, power and heat-reduction results are not guaranteed by selecting this kit.
- Check emissions eligibility: Confirm that replacing the original catalysts is permitted for your vehicle and location before purchase. California street use requires applicable CARB approval; Ultra-GREEN branding alone does not establish approval or an inspection pass.
- Confirm availability: Check the current lead time before booking installation.
CORVETTE COMPATIBILITY
- Generation and model: C8 Chevrolet Corvette Z06
- Model years: 2023–2027
- Engine: 5.5L LT6 V8
- Transmission: Eight-speed dual-clutch
- Connection arrangement: OEM manifolds or Kooks headers to OEM cat-back; verify any modified combination
Why Buy This Product from Custom Corvette Accessories
Use this Z06-specific listing to check the 218133BK kit against your LT6, model year and existing exhaust before placing an order. Custom Corvette Accessories brings the package contents, connection details and fitment questions together so you can discuss the complete combination with us and your installer before the car goes into the shop.
✅ In-stock items ship in 1–2 business days via Standard Ground.
✅ Free shipping items are available in the Continental US only.
✅ Custom quotes available for 2-Day, Next Day, or Saturday delivery.
✅ Custom or backordered items ship as soon as available.
