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BBK Competition Series Off-Road X-Pipe (99-04 4.6L)

AmericanMuscle no longer carries the BBK Competition Series Off-Road X-Pipe (99-04 4.6L). Please check out 1999-2004 Mustang Stock Length X-Pipes for an updated selection.

Features & Details

  • Improves Exhaust Flow and Sound
  • Raspy Race Car Growl
  • 2-1/2" Mandrel-Bent Aluminized Tubing
  • For Off-Road, Track Use
  • Fits 1999-2004 GT, Bullitt, Mach 1, and SVT Cobra
Increases Overall Performance. Add even more horsepower and torque to the rear wheels by eliminating those power robbing catalytic converters with a BBK Off-road X pipe. A BBK X pipe will greatly improve your pony's exhaust flow to increase overall performance and sound.

Race Car Growl. A 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 BBK Construction. This BBK direct replacement X-pipe features 2.5” diameter CNC mandrel bent aluminized tubing and a merged X crossover to improve exhaust flow. Additional features include factory O2 sensor locations, and OEM style die-stamped flanges all to ensure a perfect fit.

Application. Specifically designed to fit the 1999 to 2004 4.6L Mustangs, including the GT, Bullitt, Mach 1 and SVT Cobra. This Off-Road 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# 1669

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

What's in the Box
  • (1) Off-road X-pipe
  • (2) Down Pipes
  • (4) Bolts
  • (8) Flat washers
  • (4) Lock washers
  • (4) Nuts
Installation Info
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: No - Off-Road Use Only Fitment: 1999-2004 GT, Bullitt,
Mach 1, Cobra
Will it fit my Mustang?

    Customer Photos (21) Submit Your Photo

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      Questions & Answers (55)

      5 Top Rated Questions

      Would I be able to weld my catalytic converters onto this x pipe to make it smog legal?

      • You would be unable to weld the OEM cats to the BBK Off-Road X-Pipe. This would constitute modifying the emissions equipment causing a failure for smog testing.

      Helpful (1)

      Will I get a CEL? By putting this o/r x-pipe on will I get any CEL's because with this I'll have no cats. Thank you

      • Yes you will, if you buy some plug in mil eliminators it will fix your problem or if you have a tuner you can shut the codes off

      Helpful (1) Show 2 more answers

      can this be used as shorty x-pipe later on ? my current exhaust setup is stock headers and stock h-pipe paired with flowmasters. I've been thinking about getting this x-pipe for a long time but my only concern is that at some point later on, i will be getting bbk long tubes (money willing) and I'm not sure if i can then just simply remove the 2 extension arms that connect the X figure in the pipe to the factory headers and re-use the x-pipe (which would technically be bbk's shorty x-pipe) with my long tube headers ? I looked at both bbk's shorty and normal x-pipes and the only difference i could find was the 2 extension pipes (how ever i could be wrong).

      • Unfortunately not. The tubing lengths on this off-road mid-pipe are not the same as the shorty mid-pipe and therefore, they can not be interchanged. If you switch from stock headers to the long tubes later on, you will need to purchase the shorty mid-pipe at the same time for proper fitment.

      Helpful (1) Show 1 more answer

      does this bbl off-road x-pipe eliminate the cats

      • Yes, this x-pipe will delete the cats.

      Helpful (0)

      Will this bolt right up to a factory stage 2 roush side pipe exhaust? Trying to find options for my girlfriends roush. Hard to find direct fit options for those cars.

      • That's a great setup! This will absolutely fit with it.

      Helpful (0)
      Post Your Question
      10 More Questions
      Will this work with BBK Shorty Headers ? 1 answer
      Do I need 02 sensor extensions for this X-pipe? 1 answer
      Will this x pipe fit an automatic transmission? 1 answer
      I have already slp on my car and i want to install the off road x pipe is it legal in AZ? 1 answer
      Will this work with the bbk shorty headers that I currently have installed? I’m running bbk shorty headers, stock H pipe and magnaflow after the H pipe 1 answer
      If i have a side exit exhaust, would i have to run my pipes through the back if i buy this? 1 answer
      Do you need to buy a new gasket to use this? 1 answer
      How loud would these be on a gt with flowmaster 40s? 1 answer
      will the x-pipe section align to my factory cat pipes? looking to cut oem pipes to preserve cats for now and clamp to the new x-pipe. 1 answer
      My 02 GT already has ground clearance issues because it is lowered. Will this x-pipe create more issues due to clearance? Or will this be better with ground clearance over the stock H pipe? 1 answer

        Customer Reviews (100+) Write a Review

        Overall Rating 4.5

        out of 5 stars

        Installation Time:Afternoon

        Installation Cost:$100-$250

        • Loudness / Volume 4.644231 4.6
        • Exhaust Note 4.461538 4.5
        • Fit & Finish 4.278846 4.3
        • Bang For Your Buck 4.533654 4.5



        • 5/5

          Installation Time: Less than 1 Hour

          May 18, 2019

          Perfect fit

          Easy and quick to install and it’s a way better upgrade from stock if you’re looking to improve the sound of your 99-04 mustang

          jgotjuice

          Year: 2003 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Shop Install

          March 20, 2019

          Love

          Love the sound with a loudmouth 2 exost. Recommend

          Shane

          Year: 2003 Submodel: GT

          Helpful (0)

        • 5/5

          Installation Time: Full Day

          March 15, 2019

          Tim s

          Very good product by bbk mounted up great with bbk headers amazing upgrade sounds good highly recomend this paired with bbk header

          TimS

          Year: 2003 Submodel: Mach 1

          Helpful (0)

        • 4/5

          Installation Time: Afternoon

          March 05, 2019

          AWESOME SOUND!! But rear O2 will not reach.

          I paired the O/R x-pipe with a flowmaster catback exhaust on my 04 GT. Thing sounds insane. Since it doesn’t have cats, you will not need the rear O2 sensors. Just plug up the empty bungs and you’re good. Only issue with that is, you will get a check engine light. To resolve that, you’ll need MIL eliminators so the check engine light won’t come on. Another issue with that, the O2 bungs are further back on the x-pipes than the stock h-pipe so O2 sensors plus MIL eliminators ARE NOT going to reach. (Ask me how I know). You’ll probably need to daisy chain the O2 sensors, MIL eliminators plus some O2 sensor extensions in order for the wiring to reach.

          JRomero

          Year: 2004 Submodel: GT

          Helpful (0)

        • 5/5

          March 01, 2019

          Quite loud... But quite awesome

          I paired this BBK o/r x-pipe with the SLP Loudmouth 1 axle-back I had on my Mach 1, and the difference in sound is huge. The lack of catalytic converters makes the volume increase quite a lot, and the x-pipe design makes it very raspy as soon as you hit 2000RPM. The combination of those two things makes a godly sound that's intoxicating. I just wanna go over some things so you know what you'd be getting into... Like I said, because there's no cats, the volume increases by like, double what it would normally be, especially if you've got an axle-back exhaust like the SLP Loudmouth which is very unrestrictive, so it was already loud to begin with. I wouldn't recommend buying this if you don't want an absurdly loud exhaust, or if you daily your mustang (unless you're okay with it!) The x-pipe makes things raspy and, depending on your exhaust, possibly a bit "trumpety". Basically, your mustang won't growl so much as it will wail loudly! A lot of people like this, a lot don't, so look up videos on Youtube to help give you an idea of how yours will sound. And lastly, because of how, let's say "ineffecient" the 4.6 modular is, it has a tendancy to have a lot of unspent fuel flying into the exhaust, which causes popping and crackling sounds, which I'd think most people like. By having an x-pipe with no cats combined with an unrestrictive exhaust, your 4.6 turns into a freakin' popcorn machine! At around 3000rpm or higher, when you let off the gas, you will make people's head turn with absurd amounts of loud pops and snaps. It's an absolute blast... If this all sounds great to you, go for it, it's one of the best things you can buy for around $200.

          AveryG

          Year: 2003 Submodel: Mach 1

          Helpful (1)

        • 5/5

          Installation Time: Less than 1 Hour

          January 18, 2019

          Sounds awesome!

          I had no issues. Sounds great. All the welds were great. It paired right up with my exhaust. Couldn’t be happier

          NickC

          Year: 2000 Submodel: GT

          Helpful (4)

        • 5/5

          Installation Time: Afternoon

          January 05, 2019

          03 mustang Mach 1

          Definitely a awesome product sounds amazing with slp loudmouth 1 neighborhood doesn’t like it but I do lol

          Justin

          Year: 2003 Submodel: Mach 1

          Helpful (5)

        • 5/5

          Installation Time: Less than 1 Hour

          November 29, 2018

          Sounds amazing

          Great product. Completed the sound and loudness of my 2 valve.

          AntonioP

          Year: 2002 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Afternoon

          November 23, 2018

          BBK xPipe

          Everything needed was in the box and it bolted on with little fanfare, just needed to go to the parts store locally for one gasket for head pipe passengers side that didnt come with the kit. No biggie it was nine bucks. Added a growl to my car!

          LouanneV

          Year: 2004 Submodel: GT

          Helpful (3)

        • 1/5

          Installation Time: Afternoon

          November 19, 2018

          Too raspy

          When it says raspy it means raspy. Even in the normal driving range it sounds tinny like your dragging cans behind your car. I wouldn’t recommend and will probably put the stock h pipe back on.

          DarrenB

          Year: 2000 Submodel: GT

          Helpful (5)

        • 5/5

          Installation Time: Less than 1 Hour

          November 13, 2018

          BBK off-road x-pipe

          Had a shop install it in less then an hour no real sound increase just a a higher quality tone.

          MarkusM

          Year: 2001 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Afternoon

          November 02, 2018

          Bbk off road x pipe

          It only took all afternoon because I stripped a screw. But other wise easy to install.

          AnthonyA

          Year: 2004 Submodel: GT

          Helpful (3)

        • 5/5

          October 25, 2018

          :(

          seems like a great product but idk how i can have it installed if it removes that cat and won’t pass my emissions......

          AngieV

          Year: 2001 Submodel: GT

          Helpful (7)

        • 5/5

          Installation Time: Full Day

          October 14, 2018

          Be prepared

          Helped install my friends x pipe on a Chrysler 300, took about an hour and thought this would be similar In difficulty. Be prepared to wrestle with the passenger side nuts for hours on end, used about 2 small cans of pb blaster on them, they’re extremely hard to get to. Other than that the x pipe fits perfectly and bbk is super awesome because they provide you with brand new through-bolts to connect the x pipe to your cat back

          Wicked2Valve

          Year: 2003 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Less than 1 Hour

          September 28, 2018

          Not bad

          Had some rasp to it had to delete my flowmaster cause it was to tin sounding and added some thrush glass packs and um pretty pleased with it

          Brad

          Year: 2002 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Less than 1 Hour

          September 26, 2018

          Loud exhaust

          Good build quality. Im soley running stock headers and this x-pipe with mil plug in deletes and rear o2 sensor wire extensions. With this setup I have no check engine light and a very loud sounding exhaust. The exhaust note has gotten compliments at every drift and track event I attend. I had to make a custom support bracket that holds rear of x-pipe up

          StephenR

          Year: 2004 Submodel: GT

          Helpful (3)

        • 4/5

          Installation Time: Afternoon

          September 23, 2018

          Best first upgrade

          This and a cold air intake are the first two first upgrades you can do to your new edge, It completely changes the sound and overall experience of the car even with a stock axle back. Only thing to note is you may need oxygen sensor harness extensions for the front O2’s.

          Tim

          Year: 2001 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Afternoon

          September 04, 2018

          Perfect replacement

          Gave it the sound I was looking for. Sounds crisp and perfectly replaced the front coats. Bought the mil eliminators and didnt need them. Bama tuner fixed it all

          RichardH

          Year: 2004 Submodel: GT

          Helpful (3)

        • 5/5

          Installation Time: Afternoon

          August 31, 2018

          Loud

          Def gave my car that nice growl recommend for sure

          AndrewW

          Year: 1999 Submodel: Cobra

          Helpful (4)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: $100-$250

          August 23, 2018

          Sounds amazing

          Totally changes the sound and sounds amazing. Bolt on install.

          CurtisW

          Year: 2018 Submodel: GT

          Helpful (3)

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