Kooks Headers 1-7/8-Inch Long Tube Headers with GREEN Catted Y-Pipe
Fits 2021-2026 5.0L V8
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Price tracked 11 times since Jul 30, 2026 across the stores we check daily: low $3,864.83, high $4,127.50, currently $3,864.83.
where to buy · 2 retailers tracked
Same idea as the 2015-2020 Kooks header set - bigger, smoother tubes off the engine for better exhaust flow - built for the redesigned 2021+ truck. "Green" catted means the catalytic converters use a faster-light-off core so they clear emissions checks quicker after a cold start.
why this one — Mandrel-bent stainless with CNC-machined flanges for a precise fit, and a limited lifetime warranty on the headers themselves (2-year on the catalytic converters specifically).
No manufacturer or independent dyno figure exists for this exact catted-Y-pipe kit on an F-150. Comparable: EngineLabs.com/Westech Performance independent engine-stand dyno test isolating Kooks 1-7/8in primary long-tube headers (same tube diameter) on a built 510whp Coyote: baseline 510.4hp/398.4lb-ft to 531.2hp/406.5lb-ft (+20.8hp/+8.1lb-ft) headers-only, no Y-pipe/cats. Real-world gain on a stock, lower-output F-150 would likely be smaller than shown on that built engine - hence the conservative estimate range rather than quoting the built-engine number directly.
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