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True Dual Flow with X-Pipe Scavenging for Broad Torque and Peak Power
The Kooks 3-inch GREEN catted X-pipe completes the exhaust upgrade on 2014 and 2019 Corvette C7 Stingray, Grand Sport, and Z06 models with the LT1 6.2L V8, linking Kooks long tube headers directly to the factory NPP dual-mode mid-pipe for seamless integration that maintains 49-state emissions compliance while adding 20 and 30 rear-wheel horsepower and 25 and 35 lb-ft of torque through high-flow 300-cell metallic substrate GREEN catalytic converters and balanced crossover design.
Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges and full TIG welds, this X-pipe ensures zero leaks under extreme heat and supports over 850 HP while preserving the C7's exotic V8 soundtrack with zero drone. The precision design maintains factory ground clearance and NPP valve operation for quiet cruising or track-ready roar.
For C7 LT1 owners pairing Kooks headers with stock exhaust, the 21703300 GREEN catted X-pipe is the essential emissions-legal link that maximizes performance with factory refinement.
Key Features
- 3-inch mandrel-bent T304 stainless steel X-pipe
- GREEN 300-cell high-flow metallic catalytic converters
- Direct bolt-on to Kooks headers and OEM NPP mid-pipe
- 3/8-inch laser-cut flanges with full TIG welds
- Supports 850+ HP with proper tuning
- Preserves NPP dual-mode valve function
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
- Fits 2014 and 2019 C7 with LT1 6.2L dry-sump
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 X-pipe to Kooks header collectors with supplied gaskets
- Connect to OEM NPP 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 |
|---|---|---|---|
| 2014 and 2019 | Chevrolet | Corvette | Stingray / Grand Sport / Z06. LT1 6.2L Dry Sump |
Note: Fits all C7 with Kooks long tube headers and factory NPP exhaust. Coupe or convertible.
What's Included in the Purchase
- (1) 3" GREEN Catted X-Pipe
- Gaskets and Flange Hardware Kit
- Detailed Installation Instructions
- Part Number: Kooks 21703300
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 keep NPP valves working?
A: Yes, full dual-mode NPP function is retained -
Q: Will it work with factory headers?
A: No, requires Kooks long tube headers -
Q: How loud is it?
A: Aggressive V8 roar in track mode, refined and quiet in tour mode -
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 wooden crate with foam protection.
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