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SKU: 2861H420 | UPC: 842422178574
Kooks 1-7/8" x 3" Long Tube Headers with Catted Y-Pipe for 2014–2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2015–2020 Cadillac Escalade 6.2L L86
The Kooks 2861H420 1-7/8-inch long tube headers and catted Y-pipe kit provides the full bolt-on exhaust upgrade for 2014–2018 Chevrolet Silverado 1500, GMC Sierra 1500, and 2015–2020 Cadillac Escalade / Escalade ESV with the 6.2L L86 V8.
It replaces factory manifolds to deliver dyno-proven 50–65 rear-wheel horsepower and 45–60 lb-ft of torque gains through equal-length primaries, merged collectors, and a high-flow 3-inch catted Y-pipe that connects directly to the stock mid-section. Handcrafted from T304 stainless steel with laser-cut 3/8-inch flanges and full TIG welds, the system sharpens throttle response and adds a deep, aggressive V8 tone with no interior drone. It supports up to 850 HP while remaining 49-state emissions compliant.
Key Features
- 1-7/8-Inch Equal-Length Primaries Mandrel-bent for maximum scavenging and torque
- 3-Inch High-Flow Catted Y-Pipe Metallic core rated for 850+ HP with OEM outlet
- T304 Stainless Steel Full TIG welds and 16-gauge tubing for lifetime durability
- Merged Collectors Optimized flow for broader powerband
- Direct OEM Connection Bolts straight to factory exhaust without modifications
- Dyno Gains 50–65 RWHP and 45–60 RWTQ on stock 6.2L L86
Product Notes
- 49-state EPA compliant. Not legal in California or CARB states
- Fits all cab/bed configurations with factory 6.2L L86 engine
- O2 sensor extensions included. Drive cycle required after install
- California Proposition 65 warning applies
Warranty Limited lifetime on stainless parts and 25,000 miles on catalysts
Installation Notes
- Professional installation recommended. Vehicle lift required
- Torque header bolts to 25-30 ft-lbs in stages using supplied Stage 8 hardware
- Connect Y-pipe to factory section with included clamps and gaskets
- Recheck torque after first heat cycle and 100 miles
This Part Fits
| Year | Make | Model | Engine |
|---|---|---|---|
| 2014–2018 | Chevrolet | Silverado 1500 | 6.2L L86 V8 |
| 2014–2018 | GMC | Sierra 1500 | 6.2L L86 V8 |
| 2015–2020 | Cadillac | Escalade / Escalade ESV | 6.2L L86 V8 |
Note: Fits 2WD and 4WD models with factory 6.2L. Excludes HD trucks.
What's Included in the Purchase
- (2) 1-7/8" x 3" Long-Tube T304 Stainless Headers with Merged Collectors
- (1) 3-Inch Catted Y-Pipe with OEM Outlet
- Gaskets, Stage 8 Locking Bolts, Clamps and Hardware
- O2 Sensor Extensions
- Installation Instructions
- Part Number: Kooks 2861H420
Why Choose Kooks?
- Over 60 years of championship-winning exhaust engineering
- Handcrafted in the USA from T304 aircraft-grade stainless
- Limited lifetime warranty and dyno-tested performance
Frequently Asked Questions
-
Q: Does this fit my 2017 Silverado 1500 High Country 6.2L?
A: Yes, direct bolt-on for all 2014–2018 1500-series 6.2L models -
Q: Will it cause a check engine light?
A: No, catted Y-pipe and extensions keep all sensors in correct positions -
Q: How loud is it?
A: Deeper and louder at wide-open throttle, quiet and drone-free at cruise
Shipping & Handling
- Availability: Ships within 1-2 business days if in stock.
- Packaging: Heavy-duty Box with foam protection
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