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Maximum Flow, Full Emissions Compliance: Long Tube Power Without the Compromise
The Kooks 28643400 3-inch H.O. GREEN catted connection pipes complete the exhaust path between Kooks long tube headers and factory mid-pipe on 2023 and 2024 Cadillac Escalade V models with the supercharged 6.2L V8, providing seamless integration that maintains emissions compliance while unlocking the full power gains from header upgrades for dyno-proven improvements in throttle response and mid-range torque.
Handcrafted from T304 aircraft-quality stainless steel with 400-cell high-flow metallic substrate H.O. GREEN catalytic converters, these pipes feature mandrel-bent 3-inch tubing and precision flanges that bolt directly to OEM components for a leak-free seal under boost pressures exceeding 15 PSI. The design supports over 800 HP from tunes or pulley upgrades while preserving the Escalade V's aggressive supercharged growl without drone during highway cruising or towing up to 7,000 lbs.
For Escalade V owners pairing Kooks headers with stock exhaust, the 28643400 connection pipes deliver the essential high-flow, emissions-legal link that maximizes supercharged performance with luxury refinement.
Key Features
- 3-inch mandrel-bent T304 stainless steel tubing
- H.O. 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 800+ HP with proper tuning
- Preserves factory exhaust function and ground clearance
Product Notes
- 49-state EPA compliant not for sale or use in California or CARB states without exemption
- Requires Kooks long tube headers for proper fitment
- Includes all hardware for installation
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 collectors with supplied gaskets
- Connect to OEM mid-pipe using included hardware
- Torque flanges to 25-30 ft-lbs and check for leaks after heat cycle
This Part Fits
| Year | Make | Model | Submodel/Engine |
|---|---|---|---|
| 2023 and 2024 | Cadillac | Escalade | V 6.2L Supercharged V8 |
Note: Fits all 2023 and 2024 Escalade V with Kooks long tube headers. 4WD only.
What's Included in the Purchase
- (2) 3" H.O. GREEN Catted Connection Pipes
- Gaskets and Flange Hardware Kit
- Installation Instructions
- Part Number: Kooks 28643400
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 stock headers?
A: No, designed specifically for Kooks long tube headers -
Q: Is it emissions legal?
A: Yes, 49-state EPA compliant with H.O. GREEN cats -
Q: How much power does it add?
A: 20 and 30 RWHP when paired with headers, enhances overall system flow -
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.
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