Free Shipping On Orders Over $49. Details

Talk to a Mustang Expert
1-877-887-1105
Mon - Sun, 8:30 AM EST - 11:00 PM EST
Win 1 of 2 $15,000 Mustang Builds! Enter To Win!

SLP High Flow Catalytic Converter Kit (96-10 All)

Market Price $208.95 You Save 4% ($9.00)
Starting At

$199.95

FREE Shipping
  • Item 23034
  • MPN# M31040

Local Install Shops

Quoted installation from $125

View 3 Shops

near 19355 (change)

Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.

Will this fit your Mustang?

In Stock Ships same business day.
Ship to: ASHBURN - 20146
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

    Features, Video & Details

    • Improved Exhaust Flow
    • Universal 2.5" OD and ID Design
    • Stainless Steel Construction
    • Ceramic Substrate Material
    • Will Pass Most Emissions Tests
    • Durable Construction
    • Sold as a Set of Two

    Review & Installation Video

    Review & Install Video

    Hey, guys. Stephanie with www.americanmuscle.com, here with the review of the SLP High-Flow Catalytic Converter Kit, from 1996 to 2010 Mustangs. In this video, we're gonna talk about the materials and construction of these cats, and the install as well. I'll talk more about the install shortly, but I can tell you right now, that I'm gonna call this a two out of three wrenches in the difficulty meter because you will need to make modifications to get these installed. You should check out the SLP High-Flow Cats if you're looking for a two-and-a-half inch stainless steel Cat for a naturally aspirated setup because you're trying to abide by emissions laws. But you still wanna ditch the very restrictive factory cats, for something that's gonna open up volume, and a little bit more power from the exhaust. These high flow cats offer a good compromise between staying legal, and still having a great sounding Mustang. You also might wanna check these out if you have an off-road setup on your car currently, but you're looking to tone down the volume or the rasp a little bit. This SLP kit has two Universal, two-and-a-half inch cats that are stainless steel, with an internal ceramic substrate material. This makes these cats perfect for naturally aspirated builds. If you don't have a naturally aspirated setup, I would recommend checking out some of the other options since there is a set of cats with a metallic substrate material, for the force induction carbs. SLP claims that these will pass most emissions tests, but what I would say is that I never promise all high flow cats pass all state emissions tests. That's honestly just the name of the game, and I can't really guarantee something like that, unfortunately. I will say, though, that if you don't feel like swapping out your exhaust when you have your emissions and inspection, then there's no reason not to try these. When it comes to price, you can expect to pay just under $200 for this kit. It's the least expensive option on the site, although the pipes offered for NA cars is only about $25 more. When you're shopping for cats for force induction carbs, the things get a little bit more expensive, because you need a different material inside of the cat to handle a higher exhaust temp for those builds. When it comes to the install, depending on how you install these, you can expect to spend a few hours, and it's gonna be a two out of three wrenches in the difficulty meter because you will need to make some modifications in order to get these installed. What exactly you need to modify will change depending on if you're cutting out old cats and replacing them with these, or if you're adding these to an off-road system. But either way, it's not a terribly difficult install. You're gonna need a good socket set. Something to cut the exhaust with like a Sawzall with a fresh blade, and a jack and jack stands or a lift to get the car in the air. If you're replacing cats with these, you'll already have your location marked for you, and you can proceed. If you're putting these into an off-road system, you need to mark and cut the mid-pipe to make room for the cats. I would then file the pipe down to make it smooth after cutting. The cats do have a specific inlet and outlet side, so you wanna make sure that you have the orientation correct before installing. And you can clamp these into place or weld them in. It's up to you. Wrapping things up here with the SLP High-Flow Catalytic Converter Kit, this is a kit that offers two Universal, two-and-a-half inches stainless steel High-Flow cats, for naturally aspirated applications. These are gonna help you keep your Mustang loud, or help you tone down an off-road setup, and you can check them out more online right here, at www.americanmuscle.com.

    High Flow. Are you looking to free up your restrictive exhaust, but are required to use Catalytic Converters? AmericanMuscle has the answer in the form of SLP's High Flow Ceramic Catalytic Converter Kit.

    Durable Construction. These SLP Catalytic Converters are made out of Stainless Steel and a durable Ceramic substrate material making them perfect for naturally aspirated applications.

    Will pass most emission tests. SLP's High Flow Ceramic Catalytic Converters will pass most states emissions testing procedures. However, check your local and state ordinances for installation and usage regulations.

    Application. This SLP High Flow Catalytic Converter Kit is designed for use with Mustangs from 1996-2010 and is sold as a set of two.

    Fitment: 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Details

    What's in the Box
    • (2) Catalytic Converters
    Installation Info
    Tech Specs
    Will it fit my Mustang?
    • Bullitt - 01, 08, 09
    • Cobra - 96, 97, 98, 99, 01, 03, 04
    • Cobra R - 00
    • GT - 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
    • GT500 - 07, 08, 09, 10
    • Mach 1 - 03, 04
    • V6 - 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10

    You Might Also Like

    Customer Photos (4) Submit Your Photo

    View All 4 Photos

    More Products You Might Like

    30 Questions / 5 Answers

    Ask a Question

    Hello, I was just wondering if these catalytic coverters will be a direct fit for my 2006 Ford Mustang V6. Also, I wanted to know if they’re California smog legal. Please advise. If they’re not, please advise me on which ones are. Im in need of two. Thank you.

    GuMbY

    • Hello, Yes the SLP High Flow Catalytic Converter Kit is a direct fit for the mustang V6 from (96-10), How ever California does not like the high-flow catalytic converters, and unfortunately all the catalytic converters we have are high-flow.

      SpencerM

    Helpful (1)

    Will these cats add alot of volume to my exaust? I currently have a straight pipe from the cats back along with a small resonator and I'm looking for a little bit more volume

    WillH

    I have a stock exhaust setup except some magnaflow axle backs will these cats need a tune for them to run or will these be good without a tune?

    JamesO

    • The SLP High Flow Catalytic Converter Kit will not require a tune, however stock mid pipes will require in depth modifications to fit these cats.

      AMRobD

    Helpful (0)

    What side is the inlet side?

    MiguelV

    • Since this SLP High Flow Catalytic Converter Kit has a universal 2.5" inner and outer diameter, either side can be the inlet side.

      AMJEFF

    Helpful (0)

    Previous owner installed electric cutout switch under dash, and deleted cats and as a result the check engine light stays on. I must have cats to pass emissions. The current exhaust on my car is Flow Master. Are these cats pretty much standard and will fit my midpipes?

    MustangMelody

    • The SLP High Flow Catalytic Converter Kit is a Universal fit 2.5 inch Catalytic Converter and can be installed on any 2.5 inch exhaust pipe in the correct location.

      ChrisAM

    Helpful (0)

    I have a 2009 4.0 mustang and am currently looking at exhausts, I am pretty set on purchasing the types true dual exhaust x pipe kit, would these fit with that kit or no ?

    BryceEdgell12

    • The SLP High Flow Catalytic Converter Kit, as well as any of the high flow cats we happen to offer separately, are made for a universal fit, so it would be unlikely that it would end up being a direct bolt on. It would be safe to assume some sort of modification will be required.

      JeffAM

    Helpful (0)

    People Who Bought This Item Also Bought

    Customer Reviews (53) Write a Review

    Overall Rating 4.5

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$100-$250

    • Performance Gain 4.25641 4.3
    • Fit 4.435897 4.4



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      May 21, 2018

      Great highflow cats

      I paired these with 2 black widow neighbor hater mufflers and it sounds great. The exhaust still has plenty of sound and I can feel a difference in performance from having no cats.

      IanD

      Year: 1996 Submodel: V6

      Helpful (0)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      May 18, 2018

      Nice cats

      Not exactly the sound I was looking for had an off-road set up unfortunately the cops didn’t like that because it was too loud so I had to get cats, these cats did their job well.

      JwanR

      Year: 2006 Submodel: GT

      Helpful (1)

    • 4/5

      May 15, 2018

      High flows

      It was great, sounds aggressive. Exactly how I wanted.

      RigoR

      Year: 2006 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Afternoon

      April 30, 2018

      Kinda disappointed

      Bought these to add to LTH to pass inspection. Visually they looked and fit great but unfortunately I couldn't get my monitors to ready even with doing the drive cycles to a tee and some tune adjustments from the BAMA guys. I've read into trying different tricks on getting things to work out but I ran out a patience. Apparently there is not enough material in cats like the factory to suffice the 02's so I put on some shorties and the stock H and flew through inspection. It was a bummer because the inspector passed the visual. Think what's next is a Bassani X because I can add the cats if I want if its too raspy and pop the factory H back on for inspection. But in the end the cats are a great product. Not AM's fault and I learned a lot from this experience as I grew up building GM and MOPARS that had none of what these modern cars have. I had LTH,O/R H and MBRP axlebacks for a year and with the cats sounded really throaty and thumpy from the HR cams. But turn the page and on to the next chapter. Thanks AM

      NickP

      Year: 2008 Submodel: GT

      Helpful (1)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      April 24, 2018

      SLP Great Quality Hi- Flo Cats !

      I was getting too much drone on the freeway with x pipe and lm1’s , had local muffler shop weld these in and I am happy with the results no more droning and when you open up the throttle it is still loud. Overall happy with product would recommend to anyone looking to quiet ride while still having that raspy loud sound.

      Moises

      Year: 2003 Submodel: Mach 1

      Helpful (1)

    • 5/5

      Installation Time: Less than 1 Hour

      April 14, 2018

      Geat parts

      Got this for my 2010 mustang they work great they make my car sound more like a muscle car

      RomanF

      Year: 2010 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      March 22, 2018

      High flow cats

      Installed these on my 01 GT. Has an x-pipe that was too loud. Installed these in two and a half hours. Made a huge difference in sound and throttle response due to additional back pressure. Excellent product for the price. Would definitely recommend.

      Stephen

      Year: 2001 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      March 18, 2018

      Just the right touch!

      This is just the right touch for my 07 GT the sound and air flow with a little extra power you can't go wrong for the price I love these little cats closest thing to headers if you think your stang is too quiet just try these out I was very impressed.

      AdamR

      Year: 2007 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Afternoon

      February 10, 2018

      Mini Cats

      Long tube headers and H-Mid pipes with Pypes rear exhaust was too loud. Installed 2 Mini Cats and now the sound is bearable. Exhaust fumes are cleaner too.

      ReubenP

      Year: 2003 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: 0-$100

      January 18, 2018

      Nice flowing cats

      Bought these cats for my 02 gt. Because I was getting a high nox reading and failing emissions testing. I had previously had the BBK x pipe with high flow cat set up, which only lasted about 6,000 miles and the cats were plugged causing high intake temps. Put these on and passed with flying colors. Lost a little rumble but definitely gained power. How well they hold up is to be seen. I do spray a lil nitrous every now and then, maybe that why the bbks got fried. Paid Amigos muffler shop in Denver $100 cash to install. Cut the old ones out with a sawzall slid the new ones in welded them and I was on the road in a hr. flat. Very happy with the product so far. Very easy install on a gt Mustang

      TBONE

      Year: 2002 Submodel: GT

      Helpful (3)

    • 1/5

      Installation Time: Less than 1 Hour

      November 15, 2017

      Not as described

      Upon arrival, these catalytic converters seemed not to be a direct replacement as described in product details. Because there is no "bung" to connect sensors. Maybe it was my own fault for not looking at the photos "hard enough" given in the description though as a direct replacement. But anyways my return went great and got a full refund.

      MichaelJ

      Year: 2008 Submodel: Other

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      October 02, 2017

      SLP

      I had an off road x pipe and I was tired of the smell of gas. These cats eliminated the gasoline smell and let me pass emissions. The car still sounds great. Its loud but not too loud. I would highly recommend this product to those who want to run cats on their Mustang.

      CharlesW

      Year: 2003 Submodel: Mach 1

      Helpful (4)

    • 1/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      August 19, 2017

      These are garbage

      I bought the all xpipe that these came with, and they turned out to be bad from the factory. Fast forward a few months, and I bought these cats again to replace the old ones. After having them on for 9 days, one has already blown out. I had them professionally installed both times. I will not be buying anything made by SLP anymore. Absolute garbage.

      Anthony12

      Year: 2007 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      August 05, 2017

      Great Product

      Sound great. Difficult for install on my 02 GT with a standard H-pipe but I got them out on, broke them in, and they sound amazing. Very satisfied!

      ZaxhariahF

      Year: 2002 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      July 16, 2017

      great item

      fairly cheap and easy to install, personally i wouldn't have put them on the car but needed them to pass state safety/emission inspections. they do a great job though!

      RichardF

      Year: 2004 Submodel: GT

      Helpful (5)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $100-$250

      June 23, 2017

      Best cats on the market!

      just bought these for my Mach 1 to pass emissions. They also got rid of the horrible rasp in the exhaust. Great product from slp, and fast delivery thanks to American Muscle.

      JockJ

      Year: 2003 Submodel: Mach 1

      Helpful (3)

    • 5/5

      Installation Time: Less than 1 Hour

      April 26, 2017

      Excellent Choice!!!

      I upgraded my catalytic converter with an SLP Catalytic Converter! It was an excellent choice because it matches my SLP Loudmouth exhaust and the increase airflow is amazing. It also added a great sound to my SLP Loudmouth exhaust. It helps the Cobra draw more attention on the road. People tell me they can hear the Cobra before the even see it!!!

      QuintonT

      Year: 1998 Submodel: Cobra

      Helpful (4)

    • 1/5

      April 20, 2017

      No O2 Ports

      No ports for O2 sensors. Had to return, unfortunately.

      BryanB

      Year: 2006 Submodel: V6

      Helpful (4)

    • 4/5

      Installation Time: Less than 1 Hour

      April 15, 2017

      SLP catalytic converter

      Easy fitment you only need a 15mm deep socket my old SLP converter on the passenger side went out five thousand miles after I got it. Hopefully the new ones will last longer.

      Chickenlittle01

      Year: 2006 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Less than 1 Hour

      March 31, 2017

      Great sound

      Got more power and so loud . .On my 2005 mustang GT

      Stepphon

      Year: 2005 Submodel: GT

      Helpful (2)

    Related Mustang Categories