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)
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.
*Parts are for USA spec vehicles, please contact us to verify fitment on JDM & international models.
· · · SHIPPING · · ·
Free shipping across the contiguous 48 United States (excludes Hawaii and Alaska). Item(s) ships on the same day or within 1 business day. Delivery time is within 2 to 4 business days excluding next day deliveries. Orders over $750 require signature for delivery.
Canada customers - If eBay does not collect import & duty fees during checkout, the shipping carrier will collect them prior to delivery.
· · · RETURNS · · ·
Your complete shopping satisfaction is our #1 priority. If an item you ordered from us does not meet your expectations, please contact us within 30 days of receiving the item(s). If your order arrives damaged from shipping please contact us and we will provide a prepaid return label to send back for a replacement or refund.
Returned items must be in the original packaging (including plastic wrapped items) and in brand new condition.
Any returns received installed, mounted, used or missing components will be subject to return fee's.
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