"Kooks 1-7/8" Header and GREEN Catted Y-Pipe Kit (2021-2025 F-150) - 1371H430 Header and Connection Kit. 2021-2025 Ford F150 Coyote 5.0L 4V. Includes 1-7/8" x 3" Stainless Steel Long Tube Headers & 3" x OEM GREEN Catted Stainless Y-Pipe. Kooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off-road applications. We have won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many other racing organizations. Now with three generations of family leadership, we are proud to say that all of our products are handcrafted here in the USA and we are proud to still be independently owned and operated. And don't forget, "Get Kookin with KOOKS!" Manufactured In The USA. Kooks Uses T304 Aircraft Quality Stainless Steel. Kooks Products are Backed by a Limited Lifetime Warranty To the Original Purchaser. Kooks Products Are Dyno And Race Tested and Designed For Maximum Power. Material: