Kooks 2863H420 1-7/8x3 LT Headers & Catted Y-Pipe 19-25 GM 1500 Truck/SUV 6.2L

Vehicle Fitment

• 2019-2025 Chevrolet Silverado 1500 - V8-6.2L (L87 EcoTec3) - Long Tube Headers & Catted Y-Pipe Kit
• 2019-2025 GMC Sierra 1500 - V8-6.2L (L87 EcoTec3) - Long Tube Headers & Catted Y-Pipe Kit
• 2021-2023 Cadillac Escalade - V8-6.2L - Long Tube Headers & Catted Y-Pipe Kit
• 2021-2023 Chevrolet Suburban - V8-6.2L - Long Tube Headers & Catted Y-Pipe Kit
• 2021-2023 GMC Yukon - V8-6.2L - Long Tube Headers & Catted Y-Pipe Kit

Fitment Notes

• Fits 2019+ GM 1500 Series truck and SUV models equipped with the 6.2L V8 (L87 EcoTec3) engine only - does not fit 4.8L, 5.3L, or other engine displacements
• Y-pipe connects to the 3-1/2" OEM outlet - direct OEM-style connection to the factory cat-back system without cutting or modification
• For the GREEN cat version of this kit, see Kooks part number 2863H430 - the H420 suffix designates the standard catted Y-pipe variant
• ECU tuning is recommended after installation for optimal air/fuel ratio calibration and to realize full performance gains
• NOT legal for sale, installation, or use in California or other CARB-regulated states
• Professional installation recommended due to the complexity of long tube header installation on the 6.2L GMT1 platform

Features

• 1-7/8" primary tubes feed into 3" collectors for maximum exhaust flow velocity and scavenging on the naturally aspirated 6.2L L87 V8 - a significant improvement over the highly restrictive factory exhaust manifolds
• 3" x 3-1/2" catted stainless steel Y-pipe connects at the OEM outlet - retains emissions-compliant catalytic converter function while improving mid-pipe flow over the factory Y-pipe design
• Single Y-pipe collector layout routes dual header collectors into a single center outlet - optimized for the GM 1500 platform's chassis routing and factory cat-back connection point
• Optional Jet-Hot Extreme 1300° ceramic coating available in Classic Polish (Silver), Satin Silver, Satin Black, and Flat Black - improves heat management and corrosion protection for the under-truck environment
• Optional tumbling service available for a smooth, uniform polished finish on the header tubes
• 100% handcrafted in the USA from T304 aircraft-quality stainless steel - backed by Kooks' Limited Lifetime Warranty to the original purchaser

Specifications

• Part Number: 2863H420
• System Type: Long Tube Header & Catted Y-Pipe Connection Kit
• Primary Tube Diameter: 1-7/8 in
• Collector Diameter: 3.0 in
• Y-Pipe Inlet: 3.0 in
• Y-Pipe Outlet: 3-1/2 in (OEM connection)
• Catalytic Converter Type: Standard Catted (non-GREEN)
• Material: T304 Stainless Steel
• Finish: Natural (Uncoated); optional Jet-Hot coating available
• Hardware Included: Yes
• Gaskets Included: Yes
• Tuning Recommended: Yes
• CARB Status: Not CARB Legal
• Made in: USA (Statesville, NC)
• Warranty: Limited Lifetime Warranty to Original Purchaser

Included Components

• 1x Pair 1-7/8" x 3" T304 Stainless Steel Long Tube Headers (Driver and Passenger Side)
• 1x 3" x 3-1/2" Catted Stainless Steel Y-Pipe (OEM Outlet Connection)
• All Required Installation Hardware and Gaskets

Product Description

The Kooks 2863H420 is a complete long tube header and catted Y-pipe connection kit engineered for 2019+ GM 1500 Series trucks and SUVs equipped with the 6.2L V8 L87 EcoTec3 engine - including the Chevrolet Silverado 1500 and Suburban, GMC Sierra 1500 and Yukon, and Cadillac Escalade. The kit pairs 1-7/8" x 3" T304 stainless long tube headers with a 3" x 3-1/2" catted stainless steel Y-pipe that connects directly at the factory 3-1/2" OEM outlet - eliminating the need to cut or modify the factory cat-back. The 1-7/8" primary-to-3" collector design maximizes exhaust flow and scavenging on the naturally aspirated 6.2L V8, improving throttle response, exhaust sound character, and mid-to-high RPM power output over the factory cast iron exhaust manifolds.

The H420 suffix designates the standard catted Y-pipe variant; for the GREEN cat version, see Kooks part number 2863H430. Optional Jet-Hot Extreme 1300° ceramic coatings are available at time of order (Classic Polish, Satin Silver, Satin Black, Flat Black) for improved heat management in the under-truck exhaust environment - note coating adds 10-15 business days to lead time. An optional tumbling service for a polished header finish is also available. ECU tuning is recommended after installation. Handcrafted in Statesville, NC using T304 aircraft-quality stainless steel. Not CARB legal. Backed by Kooks' Limited Lifetime Warranty to the original purchaser - warranty void if purchased through unauthorized vendors.