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SLP Catted X-Pipe (05-09 GT)

Item 23022
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      Product Information

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


      • Increases Horsepower and Torque
      • Race Car Growl
      • Three-Piece "Modular" Design
      • High-Flow Catalytic Converters Included
      • 2.5" Mandrel-Bent Stainless Steel Tubing
      • Designed for use with Stock Manifolds or Shorty Headers
      • Fits 2005-2009 GT and 2008-2009 Bullitt Mustangs


      More Power and Torque. The SLP X-Pipe uses free-flowing mandrel-bent tubing with a genuine X style crossover and high-flow catalytic converters to provide a significant increase in horsepower and torque over the restrictive factory catted pipes.

      Race Car Growl. This free flowing SLP x-pipe for the 2005 to 2009 Mustang's not only increases power, but it also adds a raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

      Upgradable Modular Design. SLP's exclusive three-piece modular design makes it possible to easily upgrade to SLP's Long-Tube Headers without the need of purchasing a brand new X-Pipe by just removing the down pipes. This unique modular design also makes it easy to install this X-Pipe on your Mustang with just basic hand tools.

      Quality Stainless Steel Construction. Constructed entirely from 2.5" mandrel bent stainless steel tubing for improved exhaust flow, this SLP Mid Pipe features a true "X" crossover, not a poor-flowing clam shell imitation that other companies use. The included SLP High flow cats far out perform the restrictive factory catalytic converters to increase rear wheel horsepower and torque.

      Application. This Catted X-Pipe from SLP is designed as a direct bolt-on for the 2005-2009 GT and 2008-2009 Bullitt Mustangs with either aftermarket short tube headers or the factory manifolds and a dual catback exhaust installed.

      Fitment: 2005 2006 2007 2008 2009 Details

      MPN# M31538

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (32)

      Write a Review

      Ratings Summary

      4.3 out of 5 overall rating from 32 customers

      Installation Time: Full Day

      Installation Cost: $100-$250

      • September 08, 2019

        5 2006 GT - ReedD Installation Time: Afternoon

        Slp x

        Great sound and tone, different than that “every other mustang” sound

        Helpful (0)
      • April 16, 2019

        1 2007 GT - DennisH

        Sounds great hangs way too low

        Ridiculous how low this system hangs. Sounds good but uneven fit

        Helpful (0)
      • October 25, 2018

        4 2005 GT - Glenntime Installation Time: Afternoon

        Works fine.

        Works as described. Sounds loud. Was worried that this would pas NY emissions but it did

        Helpful (5)
      • September 26, 2018

        4 2005 GT - ranchero13 Installation Time: Afternoon

        I enjoy it

        The exhaust soinds great. Has a good raspy sound and a bit louder than the stock setup. The instructions that came with it weren’t exactly helpful, but the pieces aren’t exactly rocket science to figure out. The only problem I ran into was the upper driver side sensor didnt reach the hole in the pipe and i had to unhook the wires from the mount and then it reached barely

        Helpful (4)
      • February 25, 2018

        5 2006 GT - Gloera Installation Time: Less than 1 Hour

        Great X pipe!

        At 1st when i was installing the X pipe it took a while due to rusted bolts but after penetrating the bolts it was a piece of cake to install i had no issues with them, no exhaust leaks and sounds great. one thing was that after riding for 2 days the check engine came on but after 2-4 days of driving it went away and i daily my car and it has not come back on ever since. i would say this purchase is great if you are trying to pass inspection and sound great.

        Helpful (6)
      • February 20, 2018

        5 2006 GT - JohnP Installation Time: Shop Install Installation Cost: 0-$100

        Catted X-pipe

        Sounds great during acceleration. Not much difference in sound while driving at highway speed. No clearance issues.

        Helpful (7)
      • February 13, 2018

        3 2007 GT - DanA Installation Time: Afternoon

        Sounds Great!!!

        First off, when it's all said and done it sounds great paired with Pypes mid-muff cat-back. Pretty loud to still have cats. I had a little drone and rasp at first, but it's gone now after 500 miles. First problem, I didn't receive the drivers side flange, or any clamps. Probably SLP's fault instead of AM. I didn't want to cut my factory h-pipe for a flange, so I picked up a flange and 4 band clamps the same day. The install wasn't bad on Jack stands, not much room for clearance tho. Second problem, I've been running it for two months now and my check engine light came on. After a couple more days of driving it turned off. Then, it turned on again, and my code reader said cat deficiency bank 2. A week later it turns off again, and it's still off now. But, it's awsome once it's bolted up. My first time out I noticed it revved up much faster than normal from a launch, but figured out it was my tires spinning:) Low end gains are negligible, but can def feel gains 3k and up. Next up headers!

        Helpful (5)
      • February 13, 2018

        4 2005 GT - TinaR Installation Time: Afternoon

        A good replacement

        Previous owner had removed the cats, and it did not pass state inspection for me. replace with these. Still aggressively loud with a good roar. Easy to install in a couple of hours from start to finish.

        Helpful (6)
      • January 11, 2018

        5 2006 GT - Rizo426 Installation Time: Afternoon

        Nice sound!

        Great bang for buck. Check for leaks and then ride into the sunset!

        Helpful (4)
      • August 02, 2017

        5 2005 GT - WilliamB Installation Time: Afternoon


        I have this set up on my 05 GT with pypes muffler delete axlebacks and it is one of the loudest cars I have heard in person. Install was a breeze and sound is amazing. Only thing, check for leaks thoroughly. I have one on the left side of my downpipe because the clamps aren't 100

        Helpful (6)

      Questions & Answers (14 answers)

      5 Top Rated Questions

      I have the SLP Loudmouth muffler deletes on my GT. I want to get the SLP catted x-pipe and I am wanting to know two things: how much will it change the sound of my car (I'm looking to go louder) and will it cause droning?

      • The SLP Catted X-Pipe will increase both the volume of your exhaust, and make it sound more raspy/racey. While this will not cause any drone in and of itself, it will make any existing droning louder than before.

      Helpful (1)

      If the cats get damaged, are they the bolt on ones to be able to replace down the line?

      Will this cause a Check Engine Light or confuse stock o2 sensors?

      • The SLP Catted X-Pipe may cause the check engine light to come on since you are replacing the stock catalytic converters with high flow ones. It is recommended to get a tune when installing this item.

      Helpful (0)

      I've bought these and they sound great. I'm trying to add some longtime headers but I've heard no headers except slp headers will bolt on right on them. Is it true or can I buy any headers for this x pype ?

      • Hi, This X-pipe can be used with any aftermarket short tube headers for 05-09 Mustang GTs.

      Helpful (0)

      Does this replace the factor cats as mine are clogged and causing a cat failure code on cel wanting to kill two birds with one stone

      • This catted x-pipe will replace your factory mid pipe with the catalytic converters.

      Helpful (0) Show 1 more answer
      Post Your Question
      9 More Questions
      Can i pair this with borla atak axel back exhaust or does it have to be the whole cat back system for them to pair with the x pipe? 1 answer
      Hi, prior to installing this x pipe on my 2008 mustang gt/cs, my check engine light came on. I also have pypes axle back also. All welded together. My CEL is on. Is this normal? Will these pipes refrain me from passing inspection? 1 answer
      will this fit on a 2007 v6 mustang that already has the dual exhaust?? 1 answer
      Will these work with stock headers 1 answer
      what headers will work with this x-pipe because unfortunately SLP does not make headers for the 3v 05-09 mustang gts and if no other headers can go with it then what would work in this case 1 answer
      Will this x-pipe fit my bassani axle backs? 1 answer
      Will this item work with SLP Axle-Back Exhaust? I have a 2008 Ford Mustang GT/CS with SLP Axle-Back Exhaust (muffler delete) installed. I want to replace my factory H-Pipe with an X-Pipe. The description states, "This Catted X-pipe from SLP is designed as a direct bolt-on for the 2005-2009 GT... with either aftermarket short tube headers or the stock factory manifolds and a dual catback exhaust installed." It says catback not axle-back. Does that mean it won't fit on my car? Plus, do I need to replace my catalytic converters? Should I stick with the same brand as my exhaust? 1 answer
      Will slp x-pipe work with other brand long tube headers? 1 answer
      tuneing Do you need tune 3 answers

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (8) band clamps

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Standard length "X" Type Headers Required: Shorty
      Piping Material: Stainless Steel Piping Size: 2.5"
      Catalytic Converter: "Yes" Fitment: 2005-2009 GT Mustangs

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09

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