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Kooks 1-7/8" x 3" Long-Tube Headers & GREEN Catted Connection Pipes for 2006 and 2013 Chevrolet Corvette C6 Z06/ZR1 LS7 & LS9
The Kooks 2161H631 header and catted connection kit stands as the benchmark upgrade for 2006 and 2013 C6 Corvette Z06 and ZR1 owners, delivering dyno-verified gains of 55 and 70 rear-wheel horsepower and 45 and 60 lb-ft of torque by replacing the restrictive factory manifolds with true 1-7/8" long-tube primaries and high-flow 3" GREEN catted X-pipe.
Hand-tig-welded from T304 stainless steel with merged collectors and laser-cut 3/8" flanges, this system maximizes exhaust velocity across the LS7 and supercharged LS9 powerbands while maintaining 49-state emissions compliance.
The catted connection pipes bolt directly to the factory NPP (dual-mode) or aftermarket cat-back without cutting, preserving the in-cabin valve function and delivering an aggressive, crackle-free V8 note. For drivers demanding track-level performance with street-legal drivability, the 2161H631 provides the complete bolt-on solution trusted by Corvette racers worldwide.
Key Features
- 1-7/8" Long-Tube Primaries: Equal-length design with merged collectors for optimal scavenging and mid-to-top-end power.
- 3" GREEN High-Flow Cats: 49-state EPA compliant metallic substrate cats rated for 1,000+ HP.
- T304 Stainless Steel: Aircraft-grade material, fully TIG welded for lifelong durability.
- Direct Bolt-On: Connects to factory NPP exhaust or any 3" cat-back; no welding required.
- Preserves NPP Function: Dual-mode exhaust valves remain fully operational.
- Dyno-Proven: 55 and 70 RWHP & 45 and 60 RWTQ gains on otherwise stock LS7/LS9 engines.
Product Notes
- 49-state legal (EPA compliant) NOT legal for sale or use in California or CARB-adopting states.
- Fits both manual and automatic transmissions clears all factory undercarriage components.
- O2 sensor extensions included minor heat-shield trimming may be required on early 2006 models.
- California Proposition 65 warning applies.
Warranty: Limited lifetime on headers 25,000 miles on catalytic converters.
Installation Notes
- Professional installation recommended vehicle lift and exhaust hanger tool advised.
- Torque header bolts to 25 ft-lbs in three stages use anti-seize on all threads.
- Connect catted X-pipe to factory NPP using supplied clamps and gaskets.
- Perform ECU drive cycle after install for proper O2 sensor adaptation.
This Part Fits
| Year | Make | Model | Submodel/Engine |
|---|---|---|---|
| 2006 and 2013 | Chevrolet | Corvette | Z06 and LS7 7.0L |
| 2009 and 2013 | Chevrolet | Corvette | ZR1 and LS9 6.2L Supercharged |
| 2013 | Chevrolet | Corvette | 427 Convertible and LS7 7.0L |
| 2013 | Chevrolet | Corvette | 60th Anniversary 427 and LS7 |
Note: Fits all C6 Z06 & ZR1 models with factory NPP or aftermarket 3" cat-back exhaust.
What's Included in the Purchase
- (2) 1-7/8" Long-Tube Headers with Merged Collectors
- (1) 3" GREEN Catted X-Pipe Connection Section
- All Necessary Gaskets, Stage 8 Locking Header Bolts, Clamps & Hardware
- O2 Sensor Extensions
- Detailed Installation Instructions
- Part Number: Kooks 2161H631
Why Choose Kooks?
- Over 60 years of championship-winning exhaust engineering.
- 100% handcrafted in the USA using T304 aircraft-grade stainless.
- Limited lifetime warranty and unmatched customer support.
Frequently Asked Questions
-
Q: Will this trigger a check engine light?
A: No, GREEN cats and included extensions keep all O2 sensors in correct positions. -
Q: Does it work with my Borla/Akrapovič/Corsa cat-back?
A: Yes, 3" slip-fit connections mate to any standard aftermarket NPP or non-NPP system. -
Q: How much power will I gain?
A: 55 and 70 RWHP & 45 and 60 RWTQ on a stock LS7; more with cam/tune. -
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: Freight truck (liftgate available).
- Availability: Ships within 1-2 business days.
- Packaging: Heavy-duty crate with foam and corner protection.
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