Kooks Headers 1-3/4in Header and GREEN Catted Connection Pipe Kit
Fits 2021-2026 5.0L V8
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Price tracked 9 times since Jul 28, 2026: low $3,683.36, high $4,092.62, currently $3,793.86.
where to buy · 3 retailers tracked
A long-tube header and Y-pipe combo for 2021-2026 F-150s that uses 1-3/4in primary tubes paired with a green-coated catalytic converter Y-pipe.
why this one — Same GREEN catted Y-pipe concept as Kooks' 1-7/8in kit already in this catalog, but in a smaller 1-3/4in tube size — a distinct, separately-orderable part number for owners who want a different primary diameter.
Checked Kooks' own product page (kooksheaders.com/products/1371h230) on 2026-07-26: no hp, torque, dyno or rwhp gain figure stated. The page does carry a CARB notice, quoted verbatim: "California laws prohibit the use of any aftermarket exhaust part or system that modifies, removes or replaces original equipment catalysts unless the California Air Resources Board has issued an Executive Order regarding such part or system or unless the part or system is exempted by being used only on racing vehicles on closed courses." No CARB EO number is published for this kit, so no street-legal claim is made here. Prop 65 warning also present (chromium, nickel).
No published gain figure for this part, and nothing here is a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See our affiliate disclosure.