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BBK Catted H-Pipe (86-93 5.0L)

Item 56064
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      Product Information

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


      • Improves Exhaust Flow and Sound.
      • Mandrel-Bent Aluminized Tubing.
      • High Flow Catalytic Converters Included.
      • Direct Fit.
      • Fits 1986-1993 5.0L Mustangs.


      Improves Exhaust Flow. BBK designed this Catted H-pipe to maximize exhaust flow and increase horse power, their in-house dyno-testing has shown solid gains of 12-20 horsepower depending on application.

      Quality Materials. This BBK direct replacement H-pipe features 2.5” diameter CNC mandrel bent aluminized tubing, original O2 sensor locations, with two high flow catalytic converters, and factory style die-stamped flanges all to ensure maximum flow and horsepower.

      Application. Specifically designed to fit the 1986 to 1993 5.0 Mustangs this Catted H-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: 1986 1987 1988 1989 1990 1991 1992 1993 Details

      BBK 1521

      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: $100-$250

      • November 09, 2018

        5 1987 LX - a50ina50

        BBK chatted h-pipe

        I've removed and replaced numerous 1 piece h-pipes on Mustangs over the years. This was the first 3 piece BBK one that I've installed. It was very easy. Thank you BBK engineers. I would definitely recommend this h-pipe.

        Helpful (7)
      • August 16, 2017

        5 1989 GT - JohnL Installation Time: Full Day

        Great product

        Replace all of my exhaust from headers to the tailpipes these bbk cats fit great .Love how they come in 4 pieces so you can adjust them to fit your headers ,just wish they would come with the 02 sensors.

        Helpful (8)
      • July 15, 2017

        5 1986 Other - Ian Installation Time: Less than 1 Hour

        Great Product

        This catted h-pipe is great for replacing that old 4 catted stock setup and gives better flow for my 5.0

        Helpful (9)
      • January 27, 2017

        5 1993 GT - P Installation Time: Afternoon

        Awesome pipe

        BBK is the best when it comes to exhaust. This came with loads of hardware and everything about the pipe is great. There are two parts (one is just a pipe from header to cats) which I'm pretty sure allows it to work for long and shorty headers. I have shorty BBK and the sound is great! easy install just make sure to jack your pipe up and tighten everything down!

        Helpful (10)
      • February 13, 2015

        5 1993 Other - Rbkmck Installation Time: Shop Install Installation Cost: $250-$500

        BBK catted H-pipe

        Excellent product! I had a local shop install it for me, and they commented on the ease of the installation ( especially since I installed BBK shorty headers with the pipe as well!)

        Helpful (9)
      • August 06, 2014

        5 1988 GT - sap23 Installation Time: Shop Install Installation Cost: $100-$250

        BBK catted H pipe

        sounds great replaced original 4 catted unit, sure it will pass state inspection thanks

        Helpful (9)
      • June 08, 2014

        2 1992 Other - Dshaggy1 Installation Time: Afternoon

        Not welded properly

        After installing I heard an exhaust leak. Racked the car back up and found that the passenger side converter was only tack welded on at the converter inlet. Luckily I was installing it at the shop after work so I just rolled the welder over and fixed it. Didn't get as much reduction in emissions as I normally expect from new cats, but they worked good enough to scrape by the dyno test

        Helpful (10)
      • May 24, 2014

        5 1988 GT - Amplifier28 Installation Time: Afternoon

        Excellent sound!

        Great sound and deep rumble when I paired it with Flowmaster American Thunder two-chamber cat-back exhaust.

        Helpful (9)
      • August 26, 2013

        5 1992 GT - Josiah229 Installation Time: Afternoon

        Great Product!

        I bought a '92 GT recently to use both as a daily driver and to fix up. I took a risk buying a car that had failed emissions horribly, but it was for a good price. The car had a set of BBK Shorty Headers, and a BBK H-Pipe when I bought it, but I took the H-Pipe off only to discover they had punched holes through the cats. After I installed my new H-Pipe from American Muscle my car went from 3,800 HC to 17 HC at idle! Plus the H-Pipe I pulled off was a one piece so the extensions that went up to the headers were hard to get past the fire wall, and off the hangers. Where this H-Pipe is a two piece, and requires very little effort to install. I would recommend this product to anyone!

        Helpful (10)
      • May 21, 2013

        5 1992 Other - 347Tony Installation Time: Afternoon

        A deeper sound than O/R H pipe

        This catted pipe has a deeper chambered sound to it and I am confident that I will not have a problem passing the emission test.

        Helpful (10)

      Questions & Answers (7 answers)

      5 Top Rated Questions

      Will this work for a 90 5.0 manual lx convertible with OE exhaust manifolds.

      • Hey Adam, This kit is designed to be a direct fit replacement to the stock manifolds

      Helpful (1)

      will these fit directly to BBK shorty headers Item 5601? I just bought the car and noticed it has BBK shorty headers, and a no name non catted H-pipe?

      • Yes, this h-pipe will work with the BBK shorty headers.

      Helpful (0)

      Will this pass emissions in Ontario Canada?

      • You will need to check with your local emission regulations to ensure this is legal for use upon highway. If you are not sure where to look, we recommend contacting your local department of transportation and theycan point you in the right direction. 

      Helpful (0)

      Hi will these h pipes pass the emmision/smog test in California?

      • No, this BBK Catted H-Pipe is not legal for use in emission restrictive states such as California.

      Helpful (0)

      Does your car still throw engine codes with these?

      • Your vehicle should not throw any CEL codes when this is properly installed.

      Helpful (0)
      Post Your Question
      2 More Questions
      Will it fit a manual trans? 1 answer
      Shorty? Which one is this good for the bbk shorty equal or unequal or for both? 2 answers

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Catted H-pipe
      • (1) Passenger side down pipe
      • (1) Driver side down pipe
      • (1) small length of hose
      • (2) Hose clamps
      • Hardware

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Standard length "H" Type Headers Required: Shorty
      Piping Material: Aluminized Steel Piping Size: 2.5"
      Catalytic Converter: Yes Fitment: 1986-1993 5.0 V8 Mustangs

      Will It Fit My Mustang

      • GT - 87, 88, 89, 90, 91, 92, 93
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Other - 86

      Fits 5.0L V8's Only