Answer
Dec 29, 2025 - 11:33 AM
In simple terms Green Cats = OEM-style, emissions-compliant catalytic converters while “Catted” (non-green) = High-flow performance catalytic converters.
Is green cat - OEM, and the other “catted” high flow? Kooks 1-7/8" Header and Catted Y-Pipe Kit (2021-2025 F-150) - 1371H420
I was wondering what the difference is in layman’s terms between “catted” and “green cats” is one OEM and the other high flow? Could you please explain? Thanks in advance!
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Open Feb 19, 2026 - 06:26 AM
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Kooks 1-7/8" Header and Catted Y-Pipe Kit (2021-2025 F-150) - 1371H420
Header and Connection Kit. 2021-2024 Ford F150 Coyote 5.0L 4V. Includes 1-7/8
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