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BBK 3-Inch Long Tube Header Adapter Mid Pipe; Catted (15-17 GT)

Item 389771
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      Review & Installation Video

      Hey, everybody. I'm Justin with And this is my quick review of the BBK three inch long tube header adapter mid-pipe, available in either catted or off road configurations fitting your BBK header equipped 2015 and up GT. So drilling down who this kit is going to be for is actually pretty simple, guys. This mid-pipe is going to be for anybody who is either planning on purchasing or already purchased a set of BBK long tube headers, and needs the mid-pipe to complete the package. Now most aftermarket header companies will actually include the mid-pipe along with the header in one complete package. But what BBK has done is actually split this thing into two categories. You have the long tube itself along with the mid-pipe. And that's because BBK gives you so many options when it comes to choosing the right header for your setup. For instance, you're going to be looking at a ceramic versus a chrome option. A one and three-quarter versus a one and seven-eighths inch option. And then finally, a catted versus an off road option. I like this because it allows you to essentially build or create your perfect long tube setup, and still have it be one of the most affordable on the site. More on the price later, but let's first talk about the specifics of this kit. Again, guys, you do have two options when picking up this mid-pipe from BBK. We do have a catted version shown here. Going to include these two high flow cats. Will add a little bit more to the final price tag. In addition to that, they do of course, offer your off road version here. No cats anywhere to be found, and this is typically going to yield the biggest power and sound gains. Both options are going to be constructed from three inch mandrel bent aluminized steel tubing. Both options will include the two and a half inch factory style connect here, which will work with your factory exhaust in addition to most aftermarket catbacks. Along with that, BBK has included two pre-welded O2 bungs, in addition to the flanges and clamps needed for the installation. So the catted version will be the more expensive of the two, coming in around the $400 mark. And that's pretty typical whenever you compare a catted version to an off road version. Now the catted version will include these two high flow cats and will be slightly more appealing to those of you with stricter emissions rules. But as always, check with your local laws before ordering. Just some quick math here, guys. Again, the catted version around the $400 mark. You add in BBK's long tube headers, which range anywhere from $500 to $600. And you can essentially piece together your own catted long tube setup for around the $1000 mark. Maybe even a little south, which is by far and away going to be your most affordable option here at AM. The off road version, on the other hand, is going to be about half the price of the catted version. Just north of the $200 range, and will bring your all in total price for a long tube setup to just north of the $700 mark. Which should fit nicely into just about anybody's budget when it comes to shopping for long tubes. Now with all that said, guys, the quality of the BBK headers might not be as nice as some of your other options here on the site. And that's more me nitpicking material versus quality of the build. Now for instance, BBK utilizes a mild steel header along with an aluminized steel mid-pipe. Whereas most, if not all of your other options on the site will utilize some sort of 304 grade stainless steel throughout, which is just a superior metal. Really not going to affect your performance per se, but it is worth pointing out. Materials aside, the construction is very solid with the BBK headers. A nice mix of machine and hand welding, they're all pressure tested for a leak free operation. And they're all made in the USA. Since you'll most likely be installing the mid-pipe along with your BBK long tube headers, figure a full three out of three wrenches on the difficulty meter. As long tube header installs are typically going to be a chore. You're going to want to leave yourself at least a full day in the garage, maybe two to get this one done. So set aside a weekend. Make sure you have a solid set of tools on hand. But if all this sounds like it's going to be a little too much of a hassle for you, don't be afraid to leave this one up to your local shop. So to wrap this one up, guys, if you plan on getting a set of BBK long tube headers for your Coyote powered S550 GT, you're going to need one of these mid-pipes to complete the package. Whether you go catted or off road, I think you'll find the BBK options will be one of the most affordable on the market. And you can grab yours right here at

      Product Information

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


      • Required For Installation Of BBK Long Tube Headers
      • Catted Mid-Pipe Adapter
      • Connects BBK Long Tube Headers to OEM or 2.5" Exhausts
      • 3" Mandrel-Bent Aluminized Tubing
      • High Flow Catalytic Converters Included
      • Fits 2015-2017 GT Mustangs with BBK Long Tube Headers


      Required For BBK Long Tube Headers. When upgrading to a set of BBK long tube headers on your coyote powered S550 Mustang you will require a 3" to 2.5" Mid-Pipe Adapter for proper installation. This Mid Pipe adapter along with BBK Long Tube Headers will allow you the option of installing a factory catback, a BBK 2.5" catback or any other brand of 2.5" aftermarket catback on your S550 GT.

      Durable BBK Construction. Manufactured from high quality 3" diameter aluminized tubing for superior strength and corrosion resistance, this BBK Long Tube Header Adapter Mid-Pipe features smooth mandrel bends throughout the entire piping to improve exhaust flow for more power and better performance.

      High Flow Catalytic Converters. This BBK Performance Long Tube Header Adapter Mid-Pipe features a pair of high flow catalytic converters that provide a significant improvement in exhaust flow over the restrictive factory cats for an increase in horsepower and torque.

      Application. The BBK Performance 3" Catted Long Tube Header Adapter Mid-Pipe is specifically designed to be used on 2015-2017 GT Mustangs equipped with BBK's Long Tube Headers and allows for the use of your stock OEM catback, a BBK 2.5" catback or any other brand of 2.5" aftermarket catback designed to fit the 2015-2017 GT Mustang.

      Technical Note: This BBK product may not be legal for use in emission restrictive states. Check local ordinances.

      Fitment: 2015 2016 2017 Details

      MPN# 1816

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (12)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 12 customers

      Installation Time: Afternoon

      Installation Cost: $250-$500

      • July 28, 2019

        5 2017 GT - COgle Installation Time: Afternoon

        As Expected

        Installing these with BBK Long Tubes goes perfect together.

        Helpful (0)
      • June 28, 2018

        5 2015 GT - AndrewH Installation Time: Shop Install Installation Cost: $250-$500

        Works well

        These things work well with the long tube headers haven't got the tune changed yet on the car and these aren't throwing off the O2 sensors at all if you try to go with these to keep from having to use mufflers you're probably going to want to go ahead and get mufflers it's really loud especially on cold start but it sounds great

        Helpful (6)
      • March 08, 2018

        5 2016 GT - Khertz Installation Time: Afternoon

        Flows good, will throw codes.

        Sound great, flow great, but will throw catalyst codes. New tune took care of that.

        Helpful (9)
      • March 02, 2018

        5 2015 GT - Dhayes725 Installation Time: Less than 1 Hour

        Cats for the cops.

        Was pulled over in md for my mustang being to loud.. bbk longtubes ,off road pipes with Corsa Extreme catback ( that combo is extremely loud lol) so the officer issued me a repair order so I presented the bbk catted midpipe. Which took a total of maybe 30-45 to install on jack stands at night in front of my friends house. If you had a lift it would take maybe 10-15 min a very easy install. Regardless the catted midpipe is well worth it, very good quality, for and finish, and it quiets the exhaust a decent amount but still lets the car breath as it should Highly recommended for good flow Good quality and to tame down your stang just a tad

        Helpful (8)
      • February 09, 2018

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

        Works Well

        Easy to install and fits well. Paired with BBK longtubes, sounds great and just barely quieter than the off road version.

        Helpful (7)
      • January 26, 2018

        4 2015 GT - MichaelB Installation Time: Less than 1 Hour

        H/F Cats

        Perfect fit . Increased volume and tone . Would have been 5 stars but pipe is restricted at X pipe.

        Helpful (8)
      • October 31, 2017

        4 2015 GT - BritishM Installation Time: Less than 1 Hour


        Order the harness extensions and only got the rear and not the front extension. Which sucks. Wish they could of at least said they messed up the order and sent the other one or gave me my money back.

        Helpful (7)
      • August 07, 2017

        4 2016 GT - RobertS Installation Time: Shop Install

        BBK high flow cat / mid pipe

        Listed product installed with BBK long tube ceramic headers (1 7/8) and Bassani 3" cat back exhaust. Some piping fabrication was needed in order to fit the mid pipe to axle back exhaust. Results exceeded expectations with horse power and sound. I recommend that the product would specifically advise that fabrication is necessary for after market exhaust. Great product sounding product.

        Helpful (7)
      • June 21, 2017

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

        Catted mid pip

        man am i glad that i went with the catted version because if i hadn't i don't think i would be able to handle the noise. This along with bbk longtube headers, and borla atak cat back have really helped make my car sound really mean.

        Helpful (8)
      • June 09, 2017

        5 2015 GT - Wonso79

        AWESOME Product

        Fit perfectly with magnaflow competition cat back.

        Helpful (8)

      Questions & Answers (19 answers)

      5 Top Rated Questions

      will these work with a roush ab and roush x pipe thanks in advanced guys!

      • These headers and adapter will work with the OEM or a 2.5" exhaust setup.

      Helpful (1)

      I have a 2015 Ford Mustang Gt. I purchased used and came with BBK long tube headers. The check engine light is on and was told by dealer that it was because of my headers. If I install the catted mid pipe to rebook up the emissions will this get the check engine light off if it is because of emissions?

      Is this the correct adapter mid-pipe that will tie together both the BBK 1-3/4 in. ceramic long tube headers with the Ford Performance by Borla sport cat-back exhaust w/ gt350 lower valance?

      • Yes this would be perfect for the headers. As long as the piping you are connecting these to on the other end are 2.5 inches in diameter you'll be good to go. Otherwise, you will need to modify.

      Helpful (0)

      Will this adapter work with my AWE track edition catback exhaust? Thanks in advance!

      • If you are referring to this cat-back here, this adapter will be compatible with the AWE exhaust.

      Helpful (0)

      Will these work with a set of stainless power headers and MBRP exhaust?

      • The BBK 3 in. Long Tube Header Adapter Mid Pipe will only work with BBK long tube headers.

      Helpful (0)
      Post Your Question
      10 More Questions
      Will these pass inspection in Illinois? Currently have American Racing Headers 1-7/8” will these fit my current set up? 1 answer
      How much quieter is the catted vs the non catted.i don't need cats but I don't want it really loud. I have a H-pipe and stock mufflers. Don't want no unwanted attention from the law. 1 answer
      Will these bolt up to a Thermal R D Cat-Back Exhaust? 1 answer
      That is legal in California 1 answer
      I would want the Borla ATAK Cat-Back Exhaust with this BBK set up, the headers and Catted Mid Pipe, does it matter if I get the 3in or 2.5 in Cat-Back? 1 answer
      Hello will this fit my flowmaster outlaw catback system? 1 answer
      Hello will this fit my catback flowmaster outlaw exhaust system? 1 answer
      If I buy this product my engine light turn on when instaled 1 answer
      Would this mid pipe fit longtubes header made by a different company I.E; American racing, kooks, pypes? 1 answer
      Will this fit my Borla atak 2.5 catbacks? 2016 mustang gt automatic 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Catted Adapter Tubes
      • (2) 3" to 2.5" Elbows
      • (2) Clamps

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Long Tube Header AdapterType Headers Required:BBK Long Tube Headers
      Piping Material:Aluminized SteelPiping Size:3" to 2.5"
      Catalytic Converter:"Yes"Fitment:2015-2017 GT Mustangs

      Will It Fit My Mustang

      • GT - 15, 16, 17

      For use with BBK Performance Long Tube Headers

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