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Kooks 21803400 3 inch ultra green catted connection pipes for 2020-2024 Corvette C8 Stingray full pair
Kooks 21803400 catted pipes installed on 2023 Chevrolet Corvette C8 mid-engine exhaust
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Kooks 20-24 Chevrolet Corvette Stingray 6.2L V8 High Output Green 3in Catted Connecting Pipes

Kooks Headers
KSH21803400
842422181185
Connecting Pipes
Out of stock
$ 2,901.27 $ 2,611.14

Complete the System: Precision Fit Connection Pipes for Full Power Delivery

The Kooks 21803400 3-inch Ultra GREEN high-flow catted connection pipes are the perfect emissions-legal match for Kooks C8 Stingray headers, providing a direct bolt-on link from header collectors to the factory mid-pipe while delivering unrestricted flow and dyno-proven gains of 20 and 30 rear-wheel horsepower and 25 and 35 lb-ft of torque when paired with headers. Featuring 400-cell metallic substrate Ultra GREEN catalytic converters, these pipes light off quickly for emissions compliance and support over 850 HP from tunes or forced induction upgrades.

Handcrafted from T304 aircraft-quality stainless steel with mandrel-bent 3-inch tubing, 3/8-inch laser-cut flanges, and full TIG welds 100% welded construction, this kit ensures zero leaks under high boost or heat while maintaining factory ground clearance and heat shielding. The design preserves the C8’s exotic V8 soundtrack with a deeper, more aggressive tone and zero drone during normal driving.

For C8 Stingray owners who demand maximum performance with 49-state legality, the 21803400 Ultra GREEN catted connection pipes are the championship-proven link that completes the ultimate mid-engine exhaust system.

Key Features

  • 3-inch mandrel-bent T304 stainless steel tubing
  • Ultra GREEN 400-cell high-flow metallic catalytic converters
  • Direct bolt-on to Kooks headers and OEM mid-pipe
  • 3/8-inch laser-cut flanges with full TIG welds
  • Supports 850+ HP with proper tuning
  • Preserves factory heat shielding and ground clearance

Product Notes

  • 49-state EPA compliant not for sale or use in California or CARB states without exemption
  • Requires Kooks C8 Stingray headers for proper fitment
  • Includes all hardware and gaskets

California Proposition 65: Contains chemicals known to the State of California to cause cancer or reproductive harm.

Warranty: Limited lifetime on stainless construction and 25,000 miles on catalytic converters to original purchaser.

Installation Notes

  • Professional installation recommended lift required
  • Bolt pipes to Kooks header flanged outlets
  • Connect to OEM mid-pipe with supplied hardware
  • Torque flanges to 25-30 ft-lbs and run drive cycle for ECU adaptation

This Part Fits

Year Make Model Submodel/Engine
2020 and 2024 Chevrolet Corvette Stingray. LT2 6.2L V8

Note: Fits all C8 Stingray coupe and convertible with Kooks headers. Headers sold separately.

What's Included in the Purchase

  • (2) 3" Ultra GREEN Catted Connection Pipes
  • Gaskets and Flange Hardware Kit
  • Detailed Installation Instructions
  • Part Number: Kooks 21803400

Why Choose Kooks?

  • Over 60 years of championship-winning exhaust engineering
  • Handcrafted in the USA from T304 aircraft-quality stainless steel
  • Limited lifetime warranty and dyno-proven performance

Frequently Asked Questions

  • Q: Does this work with factory headers?
    A: No, designed specifically for Kooks C8 Stingray headers
  • Q: Is it 50-state legal?
    A: 49-state EPA compliant, CARB exemption required for California
  • Q: How much power does it add?
    A: 20 and 30 RWHP when paired with Kooks headers
  • 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: UPS or Fed Ex Ground.
  • Availability: Typically ships same day or next if in stock.
  • Packaging: Heavy-duty box with foam protection.

Request For Information

Have questions about Kooks 20-24 Chevrolet Corvette Stingray 6.2L V8 High Output Green 3in Catted Connecting Pipes? Fill out the form below and we'll get back to you by the next business day.
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