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Pypes High Flow Metallic Catalytic Converter Kit (86-10 All)

Item 20105
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Market Price $375.99 You Save 12% ($44.31)
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$331.68 (pair)

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    Features & Details

    • Perfect for Force Inducted Mustangs
    • Rugged Construction
    • Polished 409 Stainless Steel Exterior
    • Metallic Substrate Material
    • Small Under-Carriage Footprint
    • Will Pass Most Emissions Tests
    • 2.5" Inlet/Outlet Diameter
    • Computer Tune Required
    • Fits 1986 to 2010 Mustangs
    High Flow. Are you looking to free up your restrictive stock exhaust, but are required by law to run Catalytic Converters? Then AmericanMuscle has the answer you need in the form of Pypes High Flow Metallic Catalytic Converter Kit.

    Easy swap at the track.   Every car enthusiast knows that catalytic converters suck the lifeblood - horsepower - out of your engine. If you're running a Pypes modular x-pipe style configuration for track / racing purposes, these cats give you an easy way to be street legal when you leave the track.

    Rugged construction. These Pypes Mini Catalytic Converters are build from polished 409 stainless and feature a durable Metallic substrate material making them perfect for force inducted applications. They weigh in at 2.5 lbs each and only measure 11 inches in length.

    Small Footprint. Installed, the Pypes catalytic converters have a very Small under-carriage footprint that only takes up a virtually invisible 7” in length making them perfect for custom applications.

    Will pass most emissions tests. Pypes High Flow Metallic Catalytic Converters will pass emissions testing procedures in most states. However, check your local and state ordinances for installation and usage regulations.

    Application. The Pypes High Flow Metallic Catalytic Converter Kit is specifically designed for use with power adders such as a Supercharger, Turbo-charger, or Nitrous equipped Mustang from 1986 to 2010. If you have a naturally aspirated Mustang then check out the Pypes High Flow Ceramic Catalytic Converter Kit.

    Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Details

    MPN# CVM11K

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    Hardware included:
    • (2) Catalytic Converters
    Installation Info
    Tech Specs
    • Universal 2.5" OD and ID design
    • Polished 409 stainless steel
    • Metallic substrate material
    • Includes slots and 02 bung for 2005-2010 Mustangs
    • Sold as a set of two
    Will it fit my Mustang?
    • Bullitt - 01, 08, 09
    • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
    • Cobra R - 93, 95, 00
    • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
    • GT500 - 07, 08, 09, 10
    • LX - 87, 88, 89, 90, 91, 92, 93
    • Mach 1 - 03, 04
    • Other - 86
    • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10

      Customer Photos

        Questions & Answers (11)

        5 Top Rated Questions

        Will these cats pass smog check in California?

        • The Pypes High Flow Metallic Catalytic Converters will past most emissions test however, they are not guaranteed to pass. Since they alter emission outputs, they are very susceptible to fail against California's strict emissions tests.

        Helpful (4)

        Is a tune required with these? Will these work with the Mac Pro Chamber Mid Pipe?

        • A computer tunr would be required with these converters and they do have a 2.5" inlet/outlet which is pretty standard. As long as your Mid-pipe is this size they will work.

        Helpful (1)

        Can BAMA tune for these?

        • Bama can tune for these cats.

        Helpful (0)

        I have an 08 GT500, do I need to modify my tune to use these cats or will my current tune work and work well?

        • The Pypes High Flow Metallic Catalytic Converter Kit will typically not require any changes to your tune.

        Helpful (0)

        Is there any drawback if I install this on a naturally aspirated Mustang? Later I would go for a supercharger.

        • There should not be any issues with this on an naturally aspirated setup however since this has cats it will not be as free flowing and you may not notice much in terms of the sound difference.

        Helpful (0)
        Post Your Question
        6 More Questions
        I have a 03 Cobra with a SLP catted midpipe and catback and keep destroying the cats. Will these fit in my setup? I don't recall where the O2 sensors were positioned in the SLP setup and these cats have bungs, is there a way to cap them or do I need to relocate the 02 sensors to these cats and plug wherever they are in the SLP setup? 1 answer
        Do I need o2 sensors with these as well or can I just tune them out 1 answer
        If I purchase these, do I need o2 sensors? 1 answer
        if i install these on a mustang that isnt naturally asperated will it affect the sound I have a 05 GT and planned on installing the exhaust before major upgrades like a supercharger but I plan on installing one. will this affect the sound negatively 1 answer
        Will these run smoothly with a N/A engine? As of right now, my engine is N/A, but pretty soon down the road i plan on supercharging it. and i'd hate to have to buy a new set of cats when i do. Will these run smoothly with a N/A engine? 1 answer
        long tube headers? Will adding this stop the check engine light that comes on after installing long tube headers? 2 answers

          Customer Reviews (19) Write a Review

          Overall Rating 4.1

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$100-$250

          • Performance Gain 4.071429 4.1
          • Fit 4.714286 4.7

          • 5/5

            Installation Time: Less than 1 Hour

            September 06, 2018

            Supercharged 07 GT

            For anyone looking to remove the smell and increase flow over stock cats these are great. I ran with no cats and couldn’t stand the smell. These really cleaned it up. Didn’t remove everything but they got rid of most of it.


            Year: 2007 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Shop Install

            August 01, 2018

            They work as advertised

            Haven’t had them very long but so far I passed NJ state inspection and I have not noticed any loss in performance.


            Year: 2000 Submodel: GT

            Helpful (2)

          • 5/5

            Installation Time: Afternoon

            July 29, 2018

            06 GT with hi flos and outlaws

            Epic sound!!! Toned down when cruising, wild animal when pedal to the metal!!!. I installed non-foulers for the O2 sensors and got a custom dyno tune. 483rwhp, 432 lb-ft at 12 lbs of whipple boost. SATISFACTION!! Thanks AM


            Year: 2006 Submodel: GT

            Helpful (3)

          • 5/5

            Installation Time: Less than 1 Hour

            March 31, 2018


            So I kept going through cats because I have nitrous, and then I found these. They are absolutely amazing, sound great, and the insides don't crumble into dust with nitrous use. Highly recommend if you have forced induction, and still wanna pass emissions.


            Year: 2006 Submodel: V6

            Helpful (5)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: 0-$100

            March 25, 2018

            Beautiful Product

            They're appearance is beautiful, and so is the sound and power gain vs. stock! Only thing (because the pair only came with 2 clamps), I had to have a shop install them. Which isn't too big of a deal, the guy does great work!


            Year: 1998 Submodel: V6

            Helpful (4)

          • 1/5

            January 18, 2018

            Went bad in a couple of weeks

            Would highly recommend to stay away from this brand.


            Year: 2007 Submodel: V6

            Helpful (8)

          • 5/5

            July 15, 2017

            Pypes metallic cats

            Awesome sound on the insane Cobra thrust side awesome burble on the backing off to normal speed side. Shorter than the aftermarket cats I blew out so had to have a 2.5' piece of pipe welded on. Glad i did it.


            Year: 2003 Submodel: Cobra

            Helpful (5)

          • 5/5

            June 08, 2017

            Charlotte NC.....

   issues what so ever, additionally went thru state inspection like a breeze. No trouble lites, no codes no issues. Breathing like an animal, screaming like a beast! Get a pair!!!!


            Year: 2006 Submodel: GT

            Helpful (6)

          • 1/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            March 10, 2016

            Terrible product

            I own a 2009 gt500 with 2.5 pulley and monoblade throttle body. I thought these cats would help my Shelby breathe but instead they are choking it to death. I have less power and less gas mileage than the stock units. I will be getting these removed after only 3 days of use. What a waste. Do yourself a favor and buy another product.


            Year: 2009 Submodel: GT500

            Helpful (8)

          • 4/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            July 17, 2015

            2006 4.6 supercharged GT

            Well made outer layer that is considerably better made than stock catalytic converters. The sound is deeper without being obnoxious. Having the O2 sensor bungs already inplace is nice. So far only about 300 miles on the converters, the O2 sensors are reading out of range.


            Year: 2006 Submodel: GT Round Rock, TX

            Helpful (7)

          • 5/5

            January 20, 2015

            2006 Mustang gt

            Makes a huge difference to the way on air flows... Made my Stang feel lighter and sounds a lot better than it did befor . It's makes a great combination with the stock flowmasters... I realy recommend these bad boys


            Year: 2006 Submodel: GT Fresno, CA, USA

            Helpful (4)

          • 5/5

            Installation Time: Less than 1 Hour

            December 07, 2011


            This was an easy install. You can clamp or weld the but strongly recommend you weld them in. The appearance is sleek and clean. For those who have states that require catalac converters this is a great option. Highflow and don't restrict what you're trying to achieve in horsepower gains. Great bang for your buck. Literally!


            Year: 1998 Submodel: Other Germantown, MD

            Helpful (6)

          • 5/5

            Installation Time: Shop Install

            October 10, 2011

            Very Happy

            Replaced factory catalytic converters when they started to fall apart within, causing a rattle noise at wide open throttle. Exhaust shop removed resonators (which I didn't ask for) and factory cats when installing these, and I love the exhaust sound of my V6 now. I've had other mechanics (experienced ones at that) say to me "Is this really a V6?". Not only that, fuel economy went from 22.6mpg highway to 27.9mpg. That's significant, very happy with the product. Inspection of the cat install after the fact revealed that the due to the size and shape of the cat, the left converter is slightly too close to the body of the car since the cats do not come with heat shields. No problems there after 6 months of summer driving.


            Year: 2004 Submodel: V6 Lethbridge, AB, Canada

            Helpful (8)

          • 3/5

            Installation Time: Less than 1 Hour

            October 06, 2011


            I had bought the pypes O/R x pipe with my SLP LM1's and it was crazy loud. which was fine by me. But the exhaust smell was bad when i was in a drive thru or something like that. So i decided to buy these and it quieted it down a little bit but my check engine light is still on and i have no increase in power.


            Year: 2002 Submodel: GT New Orleans, LA

            Helpful (9)

          • 5/5

            April 01, 2011

            Excellent Price/Quality

            Great fit/finish. I have the pypes LT's w/off road X, had a great sound except for some trumpeting around 2k-3k rpm when I was accelerating hard. The cats took that away and turned it in to the perfect growl. They also got rid of the exhaust smell, which was just an added bonus. Install was easy as cake, only had to make two cuts to the modular pieces between the long tubes and mid pipe so I can always buy another set of modular pieces from Pypes if I want to go without when I take it to the track.


            Year: 2005 Submodel: GT

            Helpful (6)

          • 5/5

            October 15, 2010

            PYPES CAT. CONVERTER 86-10


            KEN ELLSWORTH

            Helpful (6)

          • 5/5

            October 14, 2010

            awesome sound and flow

            When I bought these I got the PYPES catted x pipe. The sound and flow is amazing. Fitment was horrible. I had to rig ratchet straps to pull the pipes together to bolt on. Other than that. Its a great product.

            nick f

            Helpful (9)

          • 1/5

            April 07, 2010

            be cautious

            I purchased the Pypes X pipe w/cats (Part#) EX1050 for my 94 GT. They sounded great, but I had to e-test my vehicle shortly after installing the Pypes cats after a few thousand kms on the car. The emissions (Nox) failed e-test miserebly (Ontario Canada). I put my original factory cats back on and the car passed with flying colors.

            C V

            Year: 1994 Submodel: GT

            Helpful (26)

          • 2/5

            March 24, 2010

            high flow cats

            This cats are alright but for the price they arent worth it. Consider magnaflow high flow cats. i had these installed and they went out in a 1yr.


            Helpful (22)

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