Kooks 1371H420 1-7/8" Stainless Long Tube Headers & Catted Y-Pipe for 21-25 Ford

Vehicle Fitment

• 2021-2025 Ford F-150 (5.0L Coyote V8, 4-valve) - verify exact trim, drivetrain (RWD/4WD), bed length and factory exhaust variant before installation.

Features

• 1-7/8" (1.875") primary stainless steel tubing for improved exhaust flow.
• Includes high-flow catted Y-pipe (3.0") for direct connection to OEM or aftermarket exhaust.
• Mandrel-bent 304 stainless steel construction for strength and corrosion resistance.
• CNC machined flanges and high-precision fitment for tight tolerances.
• Designed to improve throttle response, reduce back-pressure, and unlock additional horsepower/torque potential.
• Maintains original factory ride height and geometry when installed with compatible components.
• Crafted in the USA and built by a performance-heritage brand with lifetime limited warranty (to original purchaser).
• Sold as a complete long-tube header + connection kit; detailed installation hardware included.

Specifications

• Part Number: 1371H420
• Primary Tube Diameter: 1-7/8" (≈1.875")
• Collector / Y-Pipe Connection Diameter: 3.0"
• Material: 304 stainless steel
• Finish: Raw stainless steel (polish may vary depending on options/coating)
• Installation: Requires removal of factory manifolds/header section; uses original or supplied hardware.
• Ride-Height/Lift Note: Designed for stock ride height; if suspension or exhaust geometry is modified, check clearances.

Included Components

• 1x Pair of long-tube headers (driver & passenger sides) part of kit 1371H420
• 1x Catted Y-pipe (3.0") connection piece
• Complete mounting hardware kit with gaskets and fasteners

Product Description

The Kooks 1371H420 long-tube header kit is engineered specifically for the Ford F-150 equipped with the 5.0L Coyote V8 (model years 2021-2025). This premium kit replaces the restrictive factory exhaust manifolds with 1-7/8" mandrel-bent stainless tubing and pairs it with a 3.0" high-flow catted Y-pipe, allowing for optimized exhaust scavenging, enhanced engine breathing and improved overall performance.

Installation of this kit opens up the engine's potential - expect sharper throttle response, a richer exhaust note and greater horsepower/torque gains when combined with tuning. While ride height remains unchanged when used with stock springs, ensure proper fitment and clearance if your vehicle has lift kits, aftermarket suspension or modified exhaust routing. Always verify your exact year, engine, exhaust layout and drivetrain before ordering.