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!"
O2 Extension Harness 2015 Mustang 1) 8" Front Extension Harness (6-pin). Extensions are included in Header kits where needed. This part is a replacment for damaged or lost Extensions.
O2 Extension Harness 2015 Mustang 1) 8" Front Extension Harness (6-pin). Oxygen Sensor Extension harnesses are included in Header kits where needed. This part number should only be ordered as a replacment for damaged or lost Oxygen Sensor Extensions.
O2 Extension Harness 2015 Mustang 1) 8in. Front Extension Harness (6-pin). Oxygen Sensor Extension harnesses are included in Header kits where needed. This part number should only be ordered as a replacment for damaged or lost Oxygen Sensor Extensions.

Fitment:
Ford Mustang Bullitt 2019
Ford Mustang Bullitt 2020
Ford Mustang GT 2015
Ford Mustang GT 2016
Ford Mustang GT 2017
Ford Mustang GT 2018
Ford Mustang GT 2019
Ford Mustang GT 2020
Ford Mustang GT 2021
Ford Mustang GT 50 Years Limited Edition 2015
Ford Mustang GT Premium 2015
Ford Mustang GT Premium 2016
Ford Mustang GT Premium 2017
Ford Mustang GT Premium 2018
Ford Mustang GT Premium 2019
Ford Mustang GT Premium 2020
Ford Mustang GT Premium 2021
Ford Mustang Mach 1 2021
Ford Mustang Shelby GT350 2015
Ford Mustang Shelby GT350 2016
Ford Mustang Shelby GT350 2017
Ford Mustang Shelby GT350 2018
Ford Mustang Shelby GT350 2019
Ford Mustang Shelby GT350 2020
Ford Mustang Shelby GT350R 2015
Ford Mustang Shelby GT350R 2016
Ford Mustang Shelby GT350R 2017
Ford Mustang Shelby GT350R 2018
Ford Mustang Shelby GT350R 2019
Ford Mustang Shelby GT350R 2020
Ford Mustang Shelby GT500 2020