-9%
Click to zoom in
True Dual Flow with X-Pipe Scavenging for Broad Torque and Peak Power
The Kooks 21703200 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 mandrel-bent crossover design for balanced exhaust flow.
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 from tunes or cams without sacrificing ground clearance or daily drivability. The crossover configuration equalizes cylinder pulses for smoother power delivery and a deeper, more aggressive V8 note in track mode with zero drone at cruise.
For C7 LT1 owners pairing Kooks headers with stock exhaust, the 21703200 GREEN catted X-pipe is the essential emissions-legal link that maximizes performance with supercar 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
- Balances exhaust for smoother power and sound
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
- Preserves NPP dual-mode valve operation
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 21703200
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 long tube headers -
Q: Is it emissions legal?
A: Yes, 49-state EPA compliant with GREEN cats -
Q: Does it keep NPP valves working?
A: Yes, full dual-mode NPP function retained -
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.
Chevrolet Corvette Parts & Accessories
Shop Chevrolet Corvette parts and accessories at Black Ops Auto Works for C5, C6, C7, C8, Z06, ZR1, Stingray, Grand Sport, and track-focused Corvette builds. This collection includes cold air intakes, air filters, catch cans, oil separators, exhaust systems, axle-back exhausts, X-pipes, brake pads, brake rotors, big brake kits, suspension parts, sway bars, ride height simulators, carbon fiber lips, spoilers, hoods, fenders, brake ducts, lighting upgrades, wheel spacers, clutches, fuel system parts, and Corvette styling accessories. Use this Chevrolet Corvette collection to find the right upgrade by generation, product category, brand, and performance goal. Intake and exhaust upgrades help improve airflow and sound, brake upgrades support stronger stopping power, suspension parts improve handling and chassis control, carbon fiber parts add aggressive styling, and oil separators, catch cans, clutch parts, fuel system upgrades, and cooling components help support more demanding street...
View Chevrolet Corvette Parts & Accessories Products
Exhaust Systems
Black Ops Auto Works carries one of the largest selections of performance exhaust systems available online, with 7,700+ products covering cat-back exhausts, axle-back exhausts, turbo-back systems, downpipes, headers, mid-pipes, X-pipes, H-pipes, mufflers, resonators, catalytic converters, exhaust tips, and every component in between. Whether you're building a street car, a daily driver, a diesel truck, or a track build, the right exhaust upgrade is here. Shop by Exhaust System Type Cat-Back Exhaust Systems: The most popular performance exhaust upgrade. Replaces everything from the catalytic converter back for improved sound, better flow, and premium tip styling. Available in single exit, dual exit, and quad exit configurations. Axle-Back Exhaust Systems: A simpler bolt-on that replaces the rear section from the axle back. Best for drivers who want an improved exhaust note and cleaner tip appearance without a full system swap. Headers and Manifolds: Long tube headers and shorty h...
View Exhaust Systems Products
Kooks Exhaust
Shop Kooks Headers and Kooks Exhaust systems at Black Ops Auto Works for premium American-made performance exhaust upgrades. This collection includes Kooks long tube headers, shorty headers, cat-back exhaust systems, axle-back exhaust systems, connection pipes, catted connection pipes, X-pipes, Y-pipes, resonator delete pipes, catalytic converters, GREEN catalytic converters, header bolt kits, oxygen sensor extensions, exhaust clamps, and exhaust hardware for street, strip, track, and high-horsepower performance builds. Kooks Headers is known for stainless steel construction, precision fitment, aggressive exhaust sound, and proven motorsports performance. Whether you are upgrading a Ford Mustang, Chevrolet Corvette, Chevrolet Camaro, Dodge Challenger, Dodge Charger, Jeep Grand Cherokee SRT, Jeep Trackhawk, Dodge Durango, Ram 1500, Ford F-150, Ford Raptor, Cadillac Escalade V, or Chevrolet Silverado, Black Ops Auto Works carries Kooks exhaust parts designed for performance, durabilit...
View Kooks Exhaust Products
Mid Pipes
Shop mid pipes, X-pipes, H-pipes, connecting pipes, front pipes, link pipes, muffler delete pipes, resonator delete pipes, high-flow cats, and performance exhaust piping at Black Ops Auto Works. This collection includes exhaust mid-pipe upgrades for muscle cars, trucks, SUVs, imports, European performance vehicles, off-road builds, and high-horsepower street or track applications. Mid pipes are a key part of your exhaust system, connecting headers, downpipes, catalytic converters, resonators, mufflers, and cat-back exhaust systems. Whether you want improved exhaust flow, a deeper exhaust tone, reduced restriction, better sound, or a cleaner connection between exhaust components, Black Ops Auto Works carries mid pipes from trusted performance exhaust brands. Shop Mid Pipes by Brand Find performance mid pipes and exhaust components from brands in the Black Ops Auto Works catalog, including Cornerstone Performance, Solo Performance, Borla, Kooks Headers, CORSA Performance, MBRP, MagnaF...
View Mid Pipes Products