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Kooks 3-Inch Stainless Steel 5-Inch Bodied Ultra-GREEN Connection Pipes with Blankets for 2023+ Chevrolet Corvette C8 Z06 LT6 5.5L
The Kooks 218133BK Ultra-GREEN Connection Pipes with Blankets deliver a precise emissions-compliant link between aftermarket headers and OEM exhaust on 2023+ Chevrolet Corvette C8 Z06 models, tackling the challenge of maintaining high-flow while meeting federal standards under the LT6's 670-horsepower flat-plane crank demands.
These 3-inch diameter pipes feature a compact 5-inch metallic substrate body for rapid catalyst activation and sustained efficiency, wrapped in heat-dissipating blankets to reduce underbody temperatures by up to 50% and shield sensitive components. Mandrel-bent from 304 stainless steel, they bolt directly to Kooks Tri-Y headers and factory mid-pipes without adapters, enabling seamless integration that preserves torque curves from 3,000-8,600 RPM.
Dyno-proven to support the full engine output without backpressure, this kit stands as the emissions-legal path for Z06 owners pursuing header upgrades, ensuring track-ready response and street-legal operation in non-CARB states.
Key Features
- 3-Inch Mandrel-Bent Tubing: Full 3-inch diameter for unrestricted exhaust flow matching LT6 powerband.
- 5-Inch Metallic Substrate Body: High-efficiency catalyst core with quick light-off for low-emission startup.
- Heat Blanket Wrapping: Fiberglass-insulated covers on both pipes to minimize radiant heat and protect wiring/fuel lines.
- 304 Stainless Steel Construction: Fully welded for corrosion resistance and longevity under high EGTs.
- Direct Bolt-On Design: Flanged connections to Kooks headers and OEM exhaust; no welding or modifications needed.
- EPA-Compliant: 49-state legal high-flow cats tested for durability and performance.
Product Notes
- 49-state legal (EPA compliant) not for use in California or CARB-adopting states without exemption.
- Requires O2 sensor extensions if not included with headers verify ECU adaptation post-install.
- Heat blankets are removable for inspection but recommended for daily driving to control temperatures.
- Not compatible with stock manifolds designed for Kooks 1-7/8" x 2" Tri-Y headers (part #2181Y500).
- California Proposition 65: May contain chemicals known to cause cancer or reproductive harm.
Warranty: Limited lifetime on construction 25,000 miles on catalyst effectiveness.
Installation Notes
- Professional installation recommended lift vehicle and support exhaust for alignment.
- Bolt pipes to header collectors using provided gaskets and hardware torque to 25-30 ft-lbs.
- Route O2 sensors through blanket slits secure blankets with included clamps.
- Perform drive cycle to allow ECU relearn check for leaks after first heat-up.
This Part Fits
| Year | Make | Model | Submodel/Engine |
|---|---|---|---|
| 2023 and 2025 | Chevrolet | Corvette | C8 Z06 (LT6 5.5L V8) |
| 2024 and 2025 | Chevrolet | Corvette | E-Ray Z06 (LT6 5.5L V8 Hybrid) |
Note: Fits mid-engine layout with 3-inch OEM exhaust connections. Confirm header compatibility for full system.
What's Included in the Purchase
- (2) 3-Inch Ultra-GREEN Catted Connection Pipes (5-inch body length, stainless steel)
- (2) Heat Dissipation Blanket Wraps with Clamps and Hardware
- Gaskets and Flange Bolts for Header and OEM Connections
- O2 Sensor Extensions and Mounting Clips
- Detailed Installation Instructions
- Part Numbers: Connection Pipes (218133), Blankets (218133B2)
Total Package Weight: 18 lbs | Shipping Dimensions: 24" L x 12" W x 8" H (boxed for ground freight)
Why Choose Kooks?
- Over 60 years of exhaust engineering, powering NHRA, NASCAR, and SCCA champions.
- Handcrafted in the USA from T304 aircraft-quality stainless steel for precision fit.
- Limited lifetime warranty and dyno-validated for real-world gains.
Frequently Asked Questions
-
Q: Are these pipes legal in California?
A: No, 49-state EPA compliant only, CARB requires EO-numbered alternatives. -
Q: Do the blankets affect sound or flow?
A: No impact on performance, they focus on heat management without restricting exhaust. -
Q: What headers pair with this kit?
A: Kooks 1-7/8" x 2" Stepped Tri-Y Headers (2181Y500) for direct bolt-on. -
Do Kooks headers require a tune after installation?
Yes. A professional tune is strongly recommended after installing long tube headers. The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation. -
Will these headers void my factory powertrain warranty?
Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they prove the component directly caused the failure. Consult your dealer for specifics on your situation. -
Q: Do these Kooks headers require a tune after installation?
A: Yes. A professional tune is strongly recommended after installing long tube headers. The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation. -
Q: Will Kooks headers void my factory powertrain warranty?
A: Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they prove the component directly caused the failure in question. Consult your dealer for specifics. -
Q: What warranty does Kooks provide?
A: Kooks products are backed by a limited lifetime warranty to the original purchaser against defects in materials and workmanship. Racing and competition use applications may have specific warranty exclusions. Contact Kooks Performance directly for warranty details.
Shipping & Handling
- Method: Ground freight UPS/FedEx.
- Availability: Ships within 1-2 business days.
- Packaging: Foam-padded box with protective sleeves for pipes and blankets.
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