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BBK Long Tube Header O2 Extensions and Hardware Kit (15-17 GT)

Item 389761
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      Review & Installation Video

      The BBK Long Tube Header O2 Extensions and Hardware Kit is available for any 2015 or newer Mustang GT owner who has or is looking to upgrade to a set of long tube headers and wants to extend their O2 sensor harness to the bongs on the tubes in order to plug them into the sensors. The installation is literally as easy as plugging them in, which is why I'm giving it one out three wrenches on our difficulty meter. The O2 sensor harness on the S550s are just a little too short to reach the new bongs on the set of long tube headers, so the extensions will make up for that length. The quick plug-and-play style connectors have six pin harnesses and five bolts that will help get these installed and ready to go. They clip right into the factory harness on one end, then into the back of the 02 sensors, and your long tubes on the other. They're specifically used for upstream sensors, since these are the ones that are need correcting. Without these, you'll be left with useless 02s, which, of course, is not exactly street legal in most areas, and of course, will help make the exhaust gases not flow as properly, which can then lead to a poor engine performance. They have a sleeve lining on the wiring that gives them a layer of heat protection from the exhaust metal, which extends their lifetime and makes them a little bit more durable to withstand the elements. The kit comes with two extensions, one for each side of the exhaust, and will run at about 60 bucks for what you see here, which, again, is necessary if you want those O2s plugged in properly. The plug-and-play harness eliminates any need to splice in or fabricate your own set, which a lot of guys would have to do otherwise, so for the price, you're definitely making your life a lot easier, in my opinion. The installation comes with the bolts necessary to get the job done, like I said, and it really shouldn't take too long to tackle. I'd say, about 30 minutes to an hour in the driveway at home, if that. You wanna have a very basic ratchet and socket set, as well as a jack stand and jacks to safely secure the car, of course. Giving this one out of three wrenches on our difficulty meter. Now, you wanna be able to jack the car up, support the weight, plug the extensions into the factory harness in the O2s, on the long tube headers, and secure the wiring back. Obviously, plug the other end in, and you're good to go. Obviously, not too hard to tackle in your driveway at home. Just to wrap things up, if you're the owner of a 2015 or newer Mustang GT with long tube headers, you might wanna check out the BBK Long Tube Header O2 Extensions and Hardware Kit, which is available right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • BBK O2 Extension and Hardware Kit
      • Required for Installation of Long Tube Headers
      • Includes Two 6-Pin Harnesses and Five Bolts
      • Fits 2015-2017 5.0L GT Mustangs


      Required For BBK Long Tube Headers. When installing a set of BBK long tube headers on your Coyote powered S550 Mustang the factory front oxygen sensor wire harnesses come up short and won't reach the upstream O2 sensors. That is why you will need a BBK Performance O2 Extension and Hardware Kit to bridge the gap allowing you to reconnect your sensors in an easy plug-n-play fashion.

      Application. This BBK Performance O2 Extension and Hardware Kit is designed to extend the front (upstream) O2 sensor harnesses on the 2015 to 2017 GT Mustang models.

      Please Note. O2 Sensors are not included with this Extension and Hardware Kit.

      Fitment: 2015 2016 2017 Details

      MPN# 16332

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (24)

      Write a Review

      Ratings Summary

      4.7 out of 5 overall rating from 24 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • February 04, 2020

        5 2017 GT - Drtyst8ng92


        Shipped just in time for dyno day fitment 100 with long tubes

        Helpful (0)
      • July 28, 2019

        5 2017 GT - COgle Installation Time: Less than 1 Hour

        The Perfect Adaptors

        When changing O2 sensors, these adaptors are perfect for the BBK Long Tubes.

        Helpful (0)
      • June 20, 2019

        3 2016 GT - Drese

        The hardware kit comes up short

        The extensions work perfect. As far as the hardware goes, this kit doesn’t even provide half the header bolts. I had to go to two 3 different part stores to obtain enough.

        Helpful (0)
      • May 21, 2019

        5 2015 GT - Swyland Installation Time: Less than 1 Hour

        2015 fbo mustang gt

        needed extensions for the long tubes. Plug and play. Would recommend

        Helpful (0)
      • May 05, 2019

        5 2015 GT - Rickye Installation Time: Less than 1 Hour

        Life Saver

        So I actually purchased a set of longtube headers for my car the set came with Everything needed for the install but unfortunately one of the o2 extensions that came with my headers wasnt grounding so there for was giving me a bad misfire I called American muscle they told me that in order for them to send me a replacement pair I was going to have to send a shop report starting that was the problem it that it may take a few days wich I had no time to wait since i daily my car then i asked for other options and book bbk came in clutch really good quality way better than what originally came with my headers worth every penny and that fixed my horrible misfire!

        Helpful (0)
      • June 18, 2018

        5 2015 GT - Mystang07gt Installation Time: Less than 1 Hour

        Made my life easy

        East plug and play installation. Perfect length for what I needed them for.

        Helpful (5)
      • May 14, 2018

        4 2016 GT - Andrew3 Installation Time: Less than 1 Hour


        Pretty pricey for the only needing to use one of the extensions. Good overall. Plug in and play style harness.

        Helpful (6)
      • February 02, 2018

        5 2016 GT - KF Installation Time: Less than 1 Hour

        Worked perfect

        Very simple just plugs right in. The length was almost spot on. Zip tied the excess so it didn’t hang. Doesn’t get any easier than that.

        Helpful (4)
      • January 26, 2018

        5 2015 GT - MichaelB Installation Time: Less than 1 Hour

        BBK Long Tube O2 Extensions

        Perfect fit. Ordered with Long Tubes and H/F Cats.

        Helpful (5)
      • December 22, 2017

        5 2017 GT - DrewF Installation Time: Less than 1 Hour

        Good product

        Good product, nice fit, zero problems . Would recommend

        Helpful (4)

      Questions & Answers (3 answers)

      3 Top Rated Questions

      Will these work with Kooks Long Tube Headers?

      Bought bbk long tube headers for my 15 s550 5.0, but the harness extensions are for the year 2011-2014 i guess that was a mistake?

      Will the work for the Pypes Long Tube headers?

      • The O2 sensor extensions included in the BBK Long Tube Header O2 Extensions and Hardware Kit would be compatible.

      Helpful (0)
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) O2 Harness Extenders
      • (5) Bolts

      Tech Specs

      Will It Fit My Mustang

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