Kooks 2024+ Mustang GT/Dark Horse 5.0L 4V 1 3/4" x 3" Stainless Headers w/ GREEN Catted Connection Pipes and OEM Adapters. • 304 Stainless Steel Construction • 3/8" Thick Laser Cut Flanges • 1 3/4" Mandrel Bent Primaries • 3" Collectors with Kooks' Patented Scavenging Spike • Dual Bolt Pattern Header Flange • Kooks GREEN Cats EPA verified 300 Cell High Flow Catalytic Converters • Kooks GREEN Cats are engineered to perform in Modern Muscle cars up to 750 RWHP • Includes Gaskets, Oxygen Sensor Extension Harness, Clamps and Bolt Kit required for Installation • No additional parts required. 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.