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

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Market Price $208.95 You Save 4% ($9.00)
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$199.95

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  • Item 23034

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    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

    MPN# M31040

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

    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

      Customer Photos (5) Submit Your Photo

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        Questions & Answers (44)

        5 Top Rated Questions

        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?

        • 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.

        Helpful (3)

        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

        • Yes, these cats would be louder than your factory cats.

        Helpful (1)

        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 ?

        • 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.

        Helpful (1)

        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.

        • 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.

        Helpful (1)

        Do i need to buy mil eliminators with these or will they not set off the engine light at all?

        • High flow catalytic converters should not set off the check engine light.

        Helpful (1)
        Post Your Question
        10 More Questions
        How much horsepower will this give me? 1 answer
        Its good for NYS 0 answer
        Can these be used on short x pipes 0 answer
        I currently have an off road h pipe and I understand that these can be put on this midpipe but I am wondering if these will throw a code. 1 answer
        WILL I HAVE A PROBLEM SMOGGING IN CALIFORNIA WITH THIS PRODUCT? 1 answer
        Will these fit on a stock mid pipe? 1 answer
        will these require a tune ? Or can I just put them on and go ? 1 answer
        I have a 2007 mustang gt roush 427r. Would these cats be acceptable replacements? What is their lifespan? 1 answer
        How long is each converter? 1 answer
        Does it need to be welded or is that just preference? 1 answer

          Customer Reviews (62) Write a Review

          Overall Rating 4.4

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$100-$250

          • Performance Gain 4 4
          • Fit 4.229167 4.2



          • 3/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            May 15, 2019

            Know your setup and buy accordingly

            Hello on my 07 mustang GT i have a JBA long tube headers with a cat back exhaust(H-Pipe). Just recently my CAT's were starting to make noise so i replaced them with SLP High Flow Catalytic Converter Kit from (Americanmuscle.com) when i first met with the mechanic he said it would require more money due to the highflow cats being larger then the CAT's i had on, he had concerns for it rattling with the heat shield or just causing excess vibrations anyways. He still said he could make it work though for of course just a little more money. i didn't notice the noise until i was down the road and until i got off the highway. If you do decide to get highflow cats i highly suggest you get the Highflow cats from the creators of your existing exhaust set up to mitigate any possibility of a misfit. Besides that, they look really aggressive if you're looking under your car. ***PERFORMANCE GAIN*** The clarity of the exhaust is much better but that's just due to new catalytic converters being installed, the sound i think is a little louder but that might just be a Placebo Effect, I would buy this again if it fit my car properly.

            Alexander

            Year: 2007 Submodel: GT

            Helpful (1)

          • 3/5

            Installation Time: Less than 1 Hour

            February 05, 2019

            Not bad.

            Overall I suppose it's my fault! However when I purchased these I checked them both individually, MAKE SURE YOU LOOK AT THEM SIDE BY SIDE! The products I received were completely different and unfortunately I didn't find this out till one was already welded into my car. They do their job however, mechanically speaking I've had no issues with them even though I have 2 separate cats in my car I can't tell if there is any power loss or gain but it did make my car much much quieter! They both fit in rather well (needed some modification to prior pipes) as one was a 2.5in diameter and the other was a 3.5in. But otherwise they work as needed!

            BryanH

            Year: 2004 Submodel: GT

            Helpful (1)

          • 3/5

            January 18, 2019

            Install

            If you have a bbk exhaust system as I do they will not fit and I missed the fact that the exhaust is stainless steel another problem. Wish I could say something more positive the floor plan clearance won't allow them.

            GuyC

            Year: 1998 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Shop Install

            November 24, 2018

            Hi flow cats

            These work great. I had them welded on instead of clamps. No CEL and passes emissions.

            BryanE

            Year: 2001 Submodel: GT

            Helpful (7)

          • 5/5

            Installation Time: Less than 1 Hour

            October 14, 2018

            Great cats

            At first I didn’t like them. Thought they were too quiet (had straight pipes before) However, the sound grew on me. Another few things I like. Got my back pressure back so I have noticeable torque gains on the low, now it’s not ridiculously loud so I can actually race around with these and not worry about getting pulled over every ten minutes, and it has a more muscle sound to it now. Cons are now it’s the lowest point on the car. If I’m not careful I will scrape these on speed bumps.

            Jay53

            Year: 1998 Submodel: GT

            Helpful (5)

          • 1/5

            Installation Time: Afternoon

            October 06, 2018

            Not Good

            Lets start off by saying I love SLP products, but these catalytic converter are trash. I got these on 09/12/18, and installed them on 09/17/18. It is now 10/06/18 and heard a rattling noise. lifted up the car thinking something came loose. Nope the rattle was coming from inside the converters. Not sure what to do now, Im hoping American muscle can help me out with a return.

            Maxiandy562

            Year: 2002 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            August 11, 2018

            SLP purchase and instal

            had to replace cats on my late son's 2003 Mach 1 . he raced it and ran fuel very rich which took out the cats. Bought a set of Magna Flows which did not fit. Very reluctant to order another set online however lucked in to a very helpful parts person and finally found the same units that where on the car. perfect fit and easy installation.

            DonaldL

            Year: 2003 Submodel: Mach 1

            Helpful (5)

          • 5/5

            Installation Time: Less than 1 Hour

            August 07, 2018

            Brads review

            Made my car sound a little more raspy, but for the price of 199 to clear my check engine light i think it was a great buy. Car is also a little louder so thats a plus.

            BradleyM

            Year: 2003 Submodel: GT

            Helpful (6)

          • 5/5

            Installation Time: Afternoon

            July 11, 2018

            Cats

            Catalytic converters are awesome makes a sound threw pipes that sound tough

            JayR

            Year: 2004 Submodel: GT

            Helpful (8)

          • 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 (6)

          • 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 (3)

          • 4/5

            May 15, 2018

            High flows

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

            RigoR

            Year: 2006 Submodel: GT

            Helpful (3)

          • 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 (5)

          • 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 (6)

          • 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 (6)

          • 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 (7)

          • 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 (7)

          • 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 (6)

          • 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 (8)

          • 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 (8)

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