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SLP Catted X-Pipe (05-09 GT)

Market Price $399.95 You Save 4% ($16.00)
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  • Item 23022
  • MPN# M31538

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Features & Details

  • Increases Horsepower and Torque
  • Race Car Growl
  • Three-Piece "Modular" Design
  • High-Flow Catalytic Converters Included
  • 2.5" Mandrel-Bent Stainless Steel Tubing
  • Fits 2005-2009 GT and 2008-2009 Bullitt
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

What's in the Box
Hardware included:
  • (8) band clamps
Installation Info
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

People Who Bought This Item Also Bought

Most Helpful Reviews


Got this with pypes exhaust and the sund is a new evil mustang. Great price.

Helpful (1)


Before I installed the SLP catted X-pipe, I had the Roush extreme performance catback on, but it wasn't loud enough. After doing research I decided this was the one, and boy am I happy. Now people know ...

Read More
Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 18 Reviews

Customer Photos (2) Submit Your Photo

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11 Questions / 7 Answers

Ask a Question

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 ?


Helpful (0)
  • Hi, This X-pipe can be used with any aftermarket short tube headers for 05-09 Mustang GTs.

    Chris J

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


Helpful (0)
  • This catted x-pipe will replace your factory mid pipe with the catalytic converters.


Show 1 more answer

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?


Helpful (0)
  • This SLP Catted X-Pipe will bolt up to the factory cat-back exhaust, so you may install the Borla ATAK axle back without interference.


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?


Helpful (0)
  • Depending on the state that you live in will determine whether this mid-pipe will pass inspection. If you live in a state that is now adopting the California CARB regulations you may be out of luck. However as far as your CEL goes, you may have a leak somewhere. I would recommend taking it to a trusted mechanic to see if he can plug in a diagnostic tool to figure out what code your car is giving you.


will this fit on a 2007 v6 mustang that already has the dual exhaust??


Helpful (0)
  • The SLP Catted X-Pipe (05-09 GT) will be able to work with a 2005-2009 V6 Mustang that has a dual exhaust. The piping is the same size at 2.5" so they will not have to be welded or modified to match one another.


Will these work with stock headers


Helpful (0)
  • The SLP Catted X-Pipe will bolt right up to factory headers with no issues!


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Customer Reviews (18) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.5 4.5
  • Exhaust Note 4.8 4.8
  • Fit & Finish 4.2 4.2
  • Bang For Your Buck 4.9 4.9

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    November 18, 2016


    Just had Fastlane Motorsports install this carted x pipe, its paired with Borla S exhaust. Sounds the same or maybe a little less agressive at idle but my 07 GT/CS really turns heads through the gears! I can really tell a huge power gain as it feels like my car got some nasal spray and opened up the airways! Immediate difference, louder and drives smoother, well worth my $500! Great product as I am very picky and had my doubts


    Year: 2007 Submodel: GT

    Helpful (1)

  • 3/5

    Installation Time: Less than 1 Hour

    October 21, 2016

    Amazing sound SLP

    The things sound amazing. Just I use Tien S Tech springs and man do these thing hang low I scrap everywhere and even on a little bit of the uneven roses wth.. took it to a shop to install for 100$ and next fay coming back to have them a little modified and I still scrape there goes 100$ down the drain. This is frustrating.


    Year: 2006 Submodel: GT

    Helpful (1)

  • 4/5

    August 31, 2016

    Fire breathing Monster

    This was the right purchase for me. The sound is great. Real loud once you open it up. Has a real muscle car feel to the sound. The Slp catted pipes with Slp loudmouth tips work great together! Love the new mod!


    Year: 2005 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 24, 2016

    Easy installation, less than 2 hours! Great sound Improvement

    Great Product! I was wondered if I would lose any torque even tho I was suppose to gain HP. We did mine on a lift and install was a breeze, we did weld the cats to the x-pipe and the down pipes to make sure we didn't have any leaks, I only did that because of a couple previous reviews mentioning leaks. So far I am very happy, sound is very crisp and deep, a lot more than I had before and the car feels like it may be a little more responsive as well. A Very happy with the cost and the quality of the kit.


    Year: 2007 Submodel: GT

    Helpful (1)

  • 3/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    October 11, 2015

    Good but....

    Had a muffler shop do the install which was no issue. Bolted right up to the Pypes catback.. The reason for the low rating on fitment is this: These pipe hang looow.. My Mustang is stock height and I am having issues with bumps and ramp when driving day to day. I love the muscle car look which is why my car is stock height. I only plan to get new shocks, sways and control arms. I can only imagine most who love to lower their Mustangs and have these pipes installed driving day to day. So please be warned.. Other than that, fit and finish is fine, The sound is lovely and performance combined with the exhaust intake and Bama is the power I have been looking for.


    Year: 2005 Submodel: GT Carson, CA

    Helpful (1)

  • 4/5

    Installation Time: Full Day

    August 02, 2015

    Great sound!

    WOW! this xpipe really woke my 07 GT up.It sounds great and i do feel a power increase in the upper rpms.Overall the car flows so much better now! Only complaint i have is that i didnt know the CATs hang so low. My car is lowered 1.5' all around so going over bumps you really need to becareful. Other then that great product!!


    Year: 2007 Submodel: GT Brooklyn, NY

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    March 14, 2015


    Got this with pypes exhaust and the sund is a new evil mustang. Great price.


    Year: 2005 Submodel: GT Suisun, CA

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    January 21, 2015


    Before I installed the SLP catted X-pipe, I had the Roush extreme performance catback on, but it wasn't loud enough. After doing research I decided this was the one, and boy am I happy. Now people know I have arrived before they even see me. Don't buy this if you have sensitive neighbors!


    Year: 2007 Submodel: GT Maryland, USA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    February 21, 2014

    SLP catted x-pipe

    I recently was looking at some different x-pipes for my 08 stang and came across the slp, bassani and magnaflow. I had flow master in mind to but it doesn't sound all that nice. Just not the right notes. So instead I did some research on the potential gains and rumbles of these exhaust and it brought me too two choices MF or SLP. After calling American muscle first hand, George was very helpful with pointing out the cons and pros of these exhaust and places that might be of help with the fine tuning of installing it. It was such a help to know that these people actually care. I eventually went with the more cost friendly exhaust (slp) and it came out beautiful. You get that loud raspy pitch from the middle of the car and then axle back i have a magnaflow exhaust which gives it a deeper rumble. The best part is you can actually feel the gains come from the less restrictive pipes! I used bama tunes as well to help with the tuning! (SF3/X3 tuner) Well worth the money as well.


    Year: 2008 Submodel: GT Buffalo, NY, USA

    Helpful (3)

  • 5/5

    September 11, 2009


    Just installed this with my slp loudmouths and its insane it sounds clean and powerful definitely not for someone who wants a quiet car


    Helpful (3)

  • 5/5

    October 13, 2007

    Nice Exhaust pipe for Nice Price

    SLP makes great sounding and power exhaust components! Cheapest price found only on American Muscle! Would recommend to everyone!

    Anthony Kinthiseng

    Helpful (2)

  • 5/5

    October 22, 2010

    SLP Exhaust System

    Guy's I hope to here some response to this. I bought the SLP cats, x-pipe and loud moouth rear pipes(no mufflers). I took my 2008 GT Mustang to a speed shop for Dyno and my check engine light stays on now. I was informed by the speed shop that SLP's are notorious for this problem as the cats are to sensitive. they suggested a $1200. pro street computer that would tweak and resolve the problem. I called A M and they said for me to send my Diablo info and car computer info and they would write me a temporary chip to turn off the O2 sensor. But I will be a problem come Smog time next year. I called SLP and they informed to take my car to a muffler shop and have them check the left exhaust pipe that comnnects to the header maifold as they suspect exhaust leaks. My Diablo alarms indicate to rich bank 1 to rich bank 2 and ODB alarm. Please help me in which direction to pursue. Since the SLP is a clamp on modular systen I personaly would suspect exhaust leaks. You or anyone else experiencing this problem may respond to

    Jack Howe

    Year: 2008 Submodel: GT

    Helpful (5)

  • 5/5

    Installation Time: Less than 1 Hour

    August 20, 2015

    Awesome Product!!!

    Just installed on Saturday to pair with my Flowmaster American Thunder CBE and WOW! Sounds incredible! This paired with 4:10 gears, CAI, and BAMA Race tune = Holy GOD! Install was a breeze on the lift. Hardware worked as anticipated. I was stoked that I didn't see a Check Engine Light when I started it for the first time.


    Year: 2008 Submodel: GT San Diego, CA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    October 15, 2014

    Great product with Great sound

    got slp catted x-pipe installed with the slp loudmouth, and the result was so amazing. it is quite in regular driving and so loud once you put the gas down. i highly recommend this x-pipe


    Year: 2008 Submodel: GT Cookeville, TN, USA

    Helpful (1)

  • 5/5

    April 06, 2011

    SLP catted x pipe

    This x pipe went on not too easy but easy enough, i have it on my 08 gt with borla stingers and it sounds amazing! I get a lot of compliments on my cars sound and the catted x pipe was one of my favorite additions to my car! The only problem is my car is lowered so the cats scrape on most bumps so i gotta go at an angle to avoid damage, but definitely worth it!


    Year: 2008 Submodel: GT

    Helpful (2)

  • 5/5

    August 04, 2008

    Awesome X-Pipe

    Bought the SLP x-pipe a couple months ago, been very satisfied ever since I installed. Pretty simple installation, the hardest is getting to the top bolt of factory h-pipe that connects it to the headers. Fast shipping and the best price through American Muscle! Great sounding catted X-Pipe!


    Helpful (2)

  • 5/5

    July 11, 2008

    Loudest ever

    It was a pain to install, but the sound afterwards makes up for it! Love it recommend it.

    Raul Gomez

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    May 17, 2014

    SLP Catted X and SLP Loudmouth

    After several days of reading and then talking to a Tech at American Muscle, I decided to go with the SLP Catted X.The sound changed dramatically from the stock H and cats. Absolutely incredible sound notes, extremely LOUD, snarly and raspy, with the Loudmouth axel back combination. It sounds like an American muscle car should. Again, this is LOUD, if you have any concern about being too loud, this is NOT for you. Pro shop installed, all welds, no clamps, no leaks, $150. NO problem with check engine light, and passed Tennessee strict emissions test 1 hour after install. I couldn't be more happy!!


    Year: 2008 Submodel: GT Tennessee, USA

    Helpful (0)

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