Kooks 14-19 Chevrolet Corvette Stingray Z51 Grand Sport 1-7/8 x 3 Header & Catted X-Pipe Kit

Kooks 1-7/8" x 3" Long Tube Headers & Green Catted Connection Pipes for 2014–2019 Chevrolet Corvette C7 LT1 6.2L

The Kooks 2170H420 1-7/8-inch long tube headers and Green catted connection pipes give 2014–2019 Corvette C7 Stingray, Grand Sport, and Z06 owners with the dry-sump LT1 6.2L V8 the perfect torque-focused upgrade, delivering dyno-proven 50–65 rear-wheel horsepower and 45–60 lb-ft of torque gains through equal-length primaries, merged collectors, and high-flow 3-inch GREEN catted pipes that bolt straight to the factory NPP dual-mode exhaust.

Hand-built from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges and 300-cell metallic substrate cats, this system supports over 800 HP while staying 49-state emissions legal and retaining full NPP valve operation for quiet cruising or wide-open track sound. The design keeps factory ground clearance and heat shielding for daily-driven C7s without sacrificing the legendary Corvette V8 soundtrack.

For C7 LT1 owners who want massive mid-range punch with daily-driver manners, the 2170H420 kit is the championship-proven, complete bolt-on solution trusted by Corvette racers and enthusiasts everywhere.

Key Features

• 1-7/8-inch equal-length primaries for strong mid-range torque
• 3-inch GREEN high-flow metallic catalytic converters
• Full T304 stainless steel with TIG welds and 3/8-inch flanges
• Preserves factory NPP dual-mode exhaust function
• Direct bolt-on to OEM mid-pipe no cutting required
• Dyno gains of 50–65 RWHP and 45–60 RWTQ

Product Notes

• 49-state EPA compliant not for sale or use in California or CARB states without exemption
• Fits all 2014–2019 C7 with dry-sump LT1 6.2L (Stingray, Grand Sport, Z06)
• Includes O2 extensions and all necessary hardware

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 required lift and exhaust experience needed
• Remove factory manifolds and bolt headers to cylinder heads
• Connect catted pipes to collectors and OEM NPP mid-pipe
• Torque flanges to 25-30 ft-lbs and run drive cycle for ECU

This Part Fits

Note: Fits all 2014–2019 C7 with factory NPP exhaust. Excludes wet-sump and ZR1 models.

What's Included in the Purchase

• (2) 1-7/8" x 3" Long-Tube T304 Stainless Headers with Merged Collectors
• (2) 3" Green Catted Connection Pipes
• Gaskets, Stage 8 Locking Bolts, Clamps and Hardware
• O2 Sensor Extensions
• Detailed Installation Instructions
• Part Number: Kooks 2170H420

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 NPP dual-mode function is retained
• Q: Will it fit my 2018 Grand Sport?
  A: Yes, direct bolt-on for all 2014–2019 C7 LT1 dry-sump models
• Q: How much louder is it?
  A: Aggressive in track mode, refined and drone-free in tour/eco

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.