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BBK Catted X-Pipe (96-04 4.6L w/ Long Tube Headers)

Item 56137
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      Review & Installation Video

      The X-pipe I have here is available for the 4.6L SN95 owner, who might be looking to pick up a set of long-tube headers or may already have them, but wants a catted X-pipe that gives them a little bit more power, as well as a louder, raspier growl, all while staying street legal. Now, this one is going to be a very simple install, as is all mid-pipes here for the SN95s. Expect a one out of three wrenches on our difficulty meter, as far as the rating goes, and we'll talk about that later on. The first thing I want to be completely transparent about is that this X-pipe from BBK is made to only work with BBK long-tube headers. It won't work with factory manifolds or aftermarket long-tubes of a different brand. With that said, they do work in perfect harmony together. So they do work to bring you more power and more sound that brings your 4.6 to life. Now, the sound an X-pipe makes is one that gives you a nice tone, but also a loud volume as well. Now, the X name obviously comes from the shape of the tubing. Both sides are welded together to give it the X-shape and an unrestricted airflow that not only gives it more power, but it gives it a raspier sound as well. Now, the H-pipe, on the other hand, it doesn't have the welded-together shape, but actually has a cross-over giving it the letter H. Now, with that said, it may drop a couple of horsepower, because of the more restricted airflow. But it does have a deeper, throatier sound than the raspy growl of an X-pipe. Obviously, personal opinion. So if you're looking for the louder tone, X is for you. If you're looking for the deeper, muscle car sound, the H is probably in your direction. As far as power is concerned, BBK lets us know you can expect anywhere from 14 to 22 horsepower when using this X-pipe in conjunction with your BBK long-tubes. In my opinion, those are very significant numbers for something that doesn't even require a tune. But a tune, however, would give it a maximized performance gain, since this is a very impeccable mod. But obviously, it's not required here. Now, materials do have an impact on power and sound as well. This one offers two and a half-inch tubing with mandrel bends, which do help to maximize the airflow here. But the X-pipe being unrestricted doesn't really need too much more help. With that said, though, this is the catted version. So you see two catalytic converters already welded into the materials here. Now, these are high-flow cats, so they are going to be less restrictive than your stock options. But still restrictive, nonetheless. If you're looking to go all out, non-restricted, no cross-over pipes, no cats, you want to go with the off-road X-pipe version of this. However, if you're looking to keep it street legal, this is probably the one you want to go with. Speaking of legality, this unfortunately, even though it is the catted version, will not be street legal in emissions-restrictive states, such as California, or any state adapting their emissions laws. With that said, you want to check with your local laws and regulations before picking up this mid-pipe or one of the off-road ones as well. As far as price is concerned, you can expect the catted X-pipe here to be available for just north of the $400 mark. Pretty much the same price tag goes for the catted H-pipe version as well. If you're looking to cut the budget down just a little bit, you can go with the off-road version. But then again, you're looking at throwing a Check Engine light, since it is off-road. With that said, MIL eliminators or a tune will take care of that, but it does add the added hassle. So it obviously comes down to personal preference and your budget. Now, the installation, again, mid-pipe, very, very straightforward bolt-on process. One out of three wrenches on our difficulty meter. However, you're probably doing this at the same time as some long-tube headers, since they are required to make it work together. That process for the long tubes will be a lot more involved, will require a lot more knowledge, and will be a lot more difficult. However, this alone is very simple. A ratchet and socket set will do the trick, 30 minutes to an hour at the absolute most here in the driveway or garage at home. The first thing you want to do is get your Mustang in the air on a jack and jack stands, or a lift if you have access to one. Remove the O2 sensors from the port on the mid-pipe to be reinstalled onto the BBK option later. Use your ratchet and socket set to disconnect the factory mid-pipe from the flanges on the over-axle pipes, and then of course if you still have your factory manifolds installed, you want to disconnect it there as well. Now, obviously, you want to tackle the long tubes first, before you get the BBK option installed. So once they are taken care of, pop the BBK option into place, bolt it down to the over-axle pipes using the new flanges, and then on the opposite side to the long tubes. You then can replace the O2 sensors to the ports here, and then you're good to go. Well, that just about does it for me. So if you're the owner of a '96 to '04 4.6L SN95 with long-tube headers already equipped, you might want to check out the BBK catted X-pipe, which you can find right here at

      Product Information

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


      • Improves Exhaust Flow and Sound
      • Raspy Race Car Growl
      • For Use with BBK Long Tube Headers
      • High Flow Catalytic Converters Included
      • 2-1/2" Mandrel-Bent Aluminized Tubing
      • Fits 1996-2004 GT, Bullitt, Mach 1, and SVT Cobra


      More Power and Torque. BBK designed this Shorty X-pipe with high-flow catalytic converters to provide a significant increase in horsepower and torque over the restrictive stock catted pipes. Increases of 14 to 22 RWHP have been seen when installed in conjunction with BBK Long Tube Headers.

      Race Car Growl. This free flowing BBK x-pipe not only increases power, but it also adds a crisp raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

      Durable Construction. BBK's X-pipes use a free-flowing 2-1/2" diameter CNC mandrel bent aluminized tubing and a merged X crossover to improve flow. And features High flow catalytic converters to provide a significant horsepower increase over the restrictive stock cats.

      Application. This BBK Shorty catted X-Pipe is designed to fit the 1996 to 2004 4.6L V8 Mustangs, including the GT, Bullitt, Mach 1 and SVT Cobra models with BBK Long-Tube Headers installed.

      Technical Note. This BBK product is not legal for use in emission restrictive states.

      Fitment: 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

      MPN# 1638

      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: 0-$100

      • November 18, 2019

        5 2002 GT - WesleyS Installation Time: Less than 1 Hour

        Great paired with long tube headers

        This catted x-pipe looks and sounds awesome. Pairs very well with BBK long tube headers. A must buy.

        Helpful (0)
      • October 12, 2019

        5 2003 GT - mustangmarko Installation Time: Less than 1 Hour

        sounds good

        has a nice gurgle sound. Seems to get a better flow than the stock pipe.

        Helpful (0)
      • August 05, 2018

        5 1998 Cobra - Giovanni


        Reduces your loudness by 40-50 but you will most definitely feel the performance from the back pressure!!!

        Helpful (5)
      • May 28, 2018

        5 2003 GT - GaryE Installation Time: Less than 1 Hour

        great product

        great product fit pretty good with the bbk headers

        Helpful (6)
      • November 16, 2017

        4 2002 GT - GaelenC Installation Time: Less than 1 Hour

        Great sound, doesn't restrict airflow

        I purchased these with a set of BBK Chrome Long Tube headers, and I'll admit I had error after error installing the headers to the point of pulling the engine out, but once it was rebuilt and put back in, and the exhaust was installed, the car sounds great. I notice it's a lot less raspy than the offroad xpipes, but still retains that growl

        Helpful (7)
      • June 28, 2017

        5 2001 GT - cordaroy Installation Time: Afternoon

        My catted x-pipe

        The instalation on the car went well. The fit was good to the headers and mufflers it fits up tight to the bottom of the car with just enought clearance

        Helpful (8)
      • August 27, 2014

        5 2000 GT - Sincey14 Installation Time: Afternoon

        Mid pipe

        I love the new mid pipe kit. It was very easy to bolt up and put in place. It sounds awesome and gave me more power in the mid range power. I would recommend it to anyone looking to make a better sounding car

        Helpful (7)
      • December 22, 2013

        4 2004 GT - Boss1643 Installation Time: Shop Install Installation Cost: 0-$100

        Nice rumble

        Better than the o/r x pipe. This gives it a nice deep rumble without the raspy sound from an o/r pipe.

        Helpful (6)
      • March 22, 2013

        5 1998 GT - BlueTint98 Installation Time: Afternoon

        Great product!

        Great setup with the bbk long tube headers and a magnaflow magnapacks exhaust. You can feel the difference in power, with making the tubing larger and taking out the restrictive stock cats on the stock H-Pipe and making having high flowing set of cats and the X formation a must buy product. A quick install and by the end of the day I was able to drive around and make heads turn.

        Helpful (8)
      • December 23, 2012

        5 2003 GT - Darkknight03 Installation Time: Afternoon

        Great product

        Goes great with Bbk long tube headers. Great sound with the no cats.

        Helpful (11)

      Questions & Answers (9 answers)

      5 Top Rated Questions

      Will this xpipe work with mac full length headers and mac cat back exhaust?

      • As long as the flanges on the x-pipe match up with those that are on the headers and the cat back exhaust, the BBK catted x-pipe will work.

      Helpful (2)

      Will these work with Ceramic BBK long tube headers on my 03 GT along with a Borla ATAK cat-back exhaust?

      • This BBK catted x-pipe will work with a set of long tubes by BBK like item 15410, their 1-5/8 inch Ceramic long tube headers for a GT with manual transmission.

      Helpful (1)

      Will this x-pipe work with the SLP cat-back loudmouth exhaust?

      I have a 99 cobra with slp cat back exhaust which mid pipe is the way to go with bbk lt headers

      • This mid pipe is specifically designed for BBK long tube headers, so as long as you install the BBK long tubes this would do the trick, as this is designed to fit with an otherwise stock application, and the SLP catback (Item 23005) is designed to fit an otherwise stock application, so it would be safe to assume they fit together.

      Helpful (0)

      Will I pass smog in Arizona with these??

      • It will depend on your state and their emission laws. We recommend checking with your state ordinances or a local shop.

      Helpful (0)
      Post Your Question
      4 More Questions
      Will this fit with the bbk long tube headers for the 04 v6. I currently have an H pipe with a slp load mouth 1 cat back. 1 answer
      Is this Idaho smog legal with bbk lth and magnaflow mufflers on 97 cobra? 1 answer
      cali smog? I was wondering, if i put these together with long tube headers, would they pass smog in california? 2 answers
      will these bolt on with Borla stingers for a 04 Mach1 I want to hook up bbk LT headers, bbk shorty cat x pipe, and the borla stingers 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Catted shorty x-pipe
      • Installation hardware

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Shorty "X" Type Headers Required: BBK Long Tube Headers
      Piping Material: Aluminized Steel Piping Size: 2.5"
      Catalytic Converter: Yes Fitment: 1996-2004 GT, Bullitt,
      Mach 1, Cobra

      Will It Fit My Mustang

      • Bullitt - 01
      • Cobra - 96, 97, 98, 99, 01, 03, 04
      • GT - 96, 97, 98, 99, 00, 01, 02, 03, 04
      • Mach 1 - 03, 04

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