When you install a set of BBK Performance long tube exhaust headers 1633 or 16330 on your 2015 -17 Mustang GT 5.0 the O2 sensors are relocated on the header that is no longer in the factory location and the factory O2 sensor connectors will not reach to connect any longer.. These extension harnesses and bolt kit is required when Installing BBK 1633/16330 or 1856/18560 Headers on a 2015-2017 Mustang 5.0 - All harnesses feature OEM Factory connectors to allow simple plug in installation to the factory wire harness so that the relocation is super simple and does not require any splicing of the factory harness at all. (Kit Includes 2 Harnesses and 5 Bolts for installation). All BBK Performance parts are backed by a 1-YEAR manufacturer’s warranty from the original date of purchase. An optional extended warranty is also available - giving you an additional 2 or 3 years from original date of purchase. Costs for the extended warranty option can be viewed when the item is added to your cart. The manufacturer’s warranty is based on normal use and installation of each product.. O2 Sensor Wire Extension Harness; OEM Style Factory Connectors; Direct Plug-In; Additional Require S550 Exhaust Hardware Included; To Be Used w/PN[1633/16330/1856/18560];. Kit Includes 15-17 Mustang 5.0 Front O2 Harness Extensions and additional header bolts for Installation. BBK 2015 Mustang GT V6 6-Pin Front O2 Sensor Wire Harness Extensions 12 (pair) And Bolt Kit. 2015-2017 MUSTANG GT LONG TUBE HEADER INSTALL KIT O2 HARNESS EXT PLUS BOLTS. 2015-2017 MUSTANG GT LONG TUBE HEADER INSTALL KIT. DUE TO THE FACT THAT THE O2 SENSORS ARE. O2 Sensor Wire Extension Harness. Exhaust Header Installation Kit. Made In The USA. BBK Install Kit. O2SnsrExtCbl. Hardware Kit. Install Kit

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