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BBK Catted X-Pipe (99-04 4.6L)

Item 56134
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Ship to: Ashburn - 20149
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      Review & Installation Video

      Product Information

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


      • Improves Exhaust Flow and Sound
      • Raspy Race Car Growl
      • High Flow Catalytic Converters Included
      • 2-1/2" Mandrel-Bent Aluminized Tubing
      • Fits 1999-2004 GT, Bullitt, Mach 1, and SVT Cobra


      Increases Overall Performance. Add even more horsepower and torque to the rear wheels of your 4.6L Mustang with a BBK Catted X pipe. A BBK catted X pipe will greatly improve your pony's exhaust flow to increase overall performance and sound.

      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. Specifically designed to fit the 1999 to 2004 4.6L Mustangs, including the GT, Bullitt, Mach 1 and SVT Cobra. This Catted X-pipe is a direct fit replacement for the stock mid pipe.

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

      Fitment: 1999 2000 2001 2002 2003 2004 Details

      MPN# 1670

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (36)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 36 customers

      Installation Time: Full Day

      Installation Cost: $100-$250

      • February 20, 2020

        4 2001 GT - Fast6hand Installation Time: Afternoon

        Great product!

        X-pipe came packaged very well with no damage. Installation was pretty straight forward, and bolted to my Borla catback with no issues!

        Helpful (0)
      • February 17, 2020

        5 2000 GT - mwalters Installation Time: Shop Install Installation Cost: $100-$250

        Value performance

        This catted x-pipe was used to replace a rusted out Basani pipe. Fit was great and seems to be good quality. The sound is good paired with the SR Performance Cat-back.

        Helpful (0)
      • January 30, 2020

        5 2003 Mach 1 - Don

        Nice Upgrade

        Definitely a improvement in sound. Gives it a smoother and raspier tone.

        Helpful (0)
      • November 13, 2019

        5 2001 GT - seantime Installation Time: Afternoon

        Racer X

        I didnt like x pipes at first, but after having this installed, it sound much better than I thought

        Helpful (0)
      • August 26, 2019

        5 2004 Mach 1 - JamesT Installation Time: Afternoon

        Catted X pipe

        Really nice and easy to install , priced very affordable. Really happy with the purchase

        Helpful (0)
      • August 09, 2019

        4 2000 GT - 2000WhiteRoush Installation Time: Shop Install Installation Cost: 0-$100

        Catted X-Pipe

        I recently busted my stock H pipe and replaced it with this BBK Catted X-Pipe. It actually made my car quieter than the stock mid-pipe with cats, but it does have a nice sound to it. A few months later I purchased BBK's Off-road X-Pipe which woke up the stang. Extremely Loud! If you are going for noise this is not the exhaust for you.

        Helpful (0)
      • August 01, 2019

        4 2003 GT - Jimmy

        BBK Catted X-Pipe 4.6L GT

        The Fit was absolutely perfect. Sounds Good down low but as it goes up in the rpms wish it could be a bit louder but the sound is nice and added a deeper tone overall

        Helpful (1)
      • May 06, 2019

        5 2001 GT - ShawnO Installation Time: Shop Install Installation Cost: $100-$250

        Bbk x pipe

        Product was not long enough to connect to my aftermarket catback, but the shop I went to made it work. Car definitely has more power, and is noticeably louder.

        Helpful (1)
      • April 11, 2019

        5 1999 GT - Jeremiah

        Sounds great fit perfect

        BBK catted x pipe fit perfect on my 99 GT only problem I ran into was the Pypes cat backs I had installed and they didn’t fit at all and the website told me both would fit. Other than that no problem with the BBK x pipe

        Helpful (0)
      • February 22, 2019

        5 2001 GT - BrettL Installation Time: Afternoon

        Perfect Fit

        Part was easy to install, and everything lined up perfectly. I would recommend also changing the manifold to crossover pipe gasket (passenger side), as it is likely to leak if you don't. I changed all 4 oxygen sensors at the same time, and have noticed better MPG, as well as better throttle response/acceleration.

        Helpful (2)

      Questions & Answers (22 answers)

      5 Top Rated Questions

      Im new to exhaust systems and i want to buy a new one what all will i need to purchase for a 2004 mustang gt with completely stock exhaust

      • The BBK Catted X-Pipe will bolt up to the stock exhaust on a 2004 GT.

      Helpful (2)

      What is the legality of this X-pipe? Will it be legal to run in the state of Virginia or is it an "off-road use" only item?

      • We cannot comment on the legality of products we offer, outside of what is listed as off-road or CARB certified. We have found different answers state to state, county to county, and town to town. We suggest to check with your local ordinances to be safe.

      Helpful (0)

      How will this connect to MAC 1-5/8 in. Chrome Long Tube Headers and slp exhaust on 2000 mustang gt?

      How would this connect with the MAC 1-5/8 in. Chrome Long Tube Headers and Slp exhaust on a 2000 gt?

      • This cannot be used with longtube headers.

      Helpful (0)

      How would this connect with the MAC 1-5/8 in. Chrome Long Tube Headers and Slp exhaust?

      • This cannot be used with longtube headers.

      Helpful (0)
      10 More Questions
      Is there a gasket that goes in between the the x pipe and header flanges? 1 answer
      Could this connect to stock headers on my mach 1? 1 answer
      Will these work with my BBK shorty headers into a Borla cat back? 1 answer
      If I installed this one my 1999 Ford Mustang GT, would I get a check engine light? If so, how would I be able to fix that? Currently I have the Borla Atack Catback exhaust system and the rest is stock. 1 answer
      This has two cats, the stock comes with 4 is there a couple of o2 sensor plugs to keep the computer from throwing a code? Or is that something you’d have to buy separately? Thanks for the help. 1 answer
      Hey! As I put this X pipe on my mustang could I install some long tube headers while installed on my GT or do I have to buy the X pipe that's specifically for the long tube headers? Thanks. 1 answer
      I currently have the off road bbk x pipe and have a check engine light on for no cats found will the carted high flow one shut it off.. I don't want to lose performance 1 answer
      Since it has the high flow catalytic converters attached, will this still cause the CEL to come on when matched with BBK shorty header and SLP loudmouth exhaust? 1 answer
      Will the catts pass in CA smog testing? 1 answer
      Will this fit a 4.6 with a Automatic Transmission? I already have the Borla cat back set up. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Catted X-pipe
      • (2) Down pipes
      • (4) Bolts
      • (8) Flat washers
      • (4) Washers
      • (4) Nuts
      • (2) Hose clamps

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Standard length "X" Type Headers Required: Shorty or Stock Manifolds
      Piping Material: Aluminized Steel Piping Size: 2.5"
      Catalytic Converter: Yes Fitment: 1999-2004 GT, Bullitt,
      Mach 1, Cobra

      Will It Fit My Mustang

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

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