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

75 Reviews
Our Price


  • Item #20036
  • MPN# CVM10K

  • Market Price $238.99
  • You Save 10% ($24.00)
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Product Videos Customer Photos
  • Perfect for Naturally Aspirated Mustangs
  • Durable Construction
  • Polished 409 Stainless Steel Exterior
  • Ceramic Substrate Material
  • Small Under-Carriage Footprint
  • Will Pass Most Emissions Tests
  • 2.5" Inlet/Outlet Diameter
  • 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 Ceramic 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.

Durable construction. These Pypes Mini Catalytic Converters are built from polished 409 stainless and feature a durable Ceramic substrate material making them perfect for naturally aspirated 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 Ceramic 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 Ceramic Catalytic Converter Kit is designed for use with naturally aspirated Mustangs from 1986 to 2010. If you have a Mustang equipped with power adder check out the Pypes High Flow Metallic 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

What's in the Box
  • (2) Catalytic Converters
Installation Info
Tech Specs
  • Universal 2.5" OD and ID design
  • Polished 409 stainless steel
  • Ceramic 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
  • Foxbody - 86, 87, 88, 89, 90, 91, 92, 93
  • Mach 1 - 03, 04
  • V6 - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
  • Cobra - 94, 95, 96, 97, 98, 99, 01, 03, 04
  • GT - 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10
  • GT500 - 07, 08, 09, 10

Most Helpful Reviews


I am running the pypes mm system on my 07 gt and it just wasnt loud enough for me with the stock cats so I tried an off road h. it sounded awesome but a little to loud for an everyday driver so I bought ...

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Helpful (1)

Great Quality

I have not installed these yet because im waiting for the O/R H-Pipe that i ordered with it to ship since it got put on backorder, so I will be updating this later. As for these cats, they arrived in ...

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Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 75 Reviews

Review & Install Video

Hey I’m Justin with, and I’m going to be reviewing Pypes high flow cat system for all 1986-2010 Mustangs. These cats are going to be a great compromise for those of you who are required by law to run some sort of catalytic converter system yet still allow you to ditch those ultra restrictive factory cats for something that’s going to flow a lot better, making for more power and sound versus your stock cats. These are going to also be great for someone who might currently be running an offroad X or H pipe, and just wants to tone down that rasp a little bit. This system from Pypes features durable 409 polished stainless steel construction and a very small footprint. This is going to be great for those of you going with a custom exhaust setup, or those of you who might be lowered an inch or two, and won’t have to worry about scraping these over speed bumps. A very important thing to point out with this particular system is that it features a ceramic substrate material on the inside. This system should only be used if you’re naturally aspirated, if you’re forced induction, then you’ll definitely want to check out Pypes’ other system, which features a metallic substrate on the inside, which is far more suitable to handle those higher exhaust gas temperatures. Getting the cats installed should only take you about 2 hours using these two supplied clamps. However, depending on your exhaust setup, you might need to go to your local parts store, and just pick up a couple more clamps. So if you’d like to go to an off road X or H pipe but your local laws just won’t allow for it, or you just want to get rid of some of that excessive rasp with your aftermarket exhaust, without hurting your power, you’ll definitely want to check out a set of these affordable high flow cats from Pypes Performance.

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28 Questions / 9 Answers

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I have an off-road x pipe that has no cats, can these replace the two converters that are directly off the headers?


  • Absolutely yes.


    Good Answer (0) (0)

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need to know how bad it will take sound away I live in virginia we have inspections every year and I have a off road h pipe with 10 series flowmasters I bought from you guys and I love the way it sounds now If I buy them will it tone me down and if so would it hurt if I gut them all I really need is shields for visual but dont think you sell them


  • For most exhaust systems this will actually produce a louder sound. With an offload x or h pipe it will only take away a slight amount of the sound that would normally be produced from it.


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Pypes mid muffler Will this work with the Pypes mid muffler true dual?


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Mid-muffler Will this work with the true dual Mid-muffler design??


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Sound good with roush axleback and pypes x pipe? Will these high flow cats sound good with roush axleback and pypes x pipe? Will it make my mustang any louder?


  • yes a little louder. And it will get a little more HP.


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Sound and fitment? I have a 2005 v6 with stock headers and cats. I had it converted to a true dual exhaust at a local muffler shop. The rest of the exhaust consists of regular 2.5 in piping, magnaflow mid-mufflers and 3 in tips. It sounds good, however, the pitch is a little higher than I would like and it doesn't sound the greatest at idle. My plan is to buy pypes shorty headers, pypes high flow cats, and a pypes off road x pipe. I'm looking for a deeper, throatier rumble. Would these mods do the trick and deepen the exhaust note and make it a little bit louder? And how much of difference would the pypes cats make with the other mods? Also, should all of these mods fit together fairly easy?


  • They fit fine. If you are doing a full exhaust you will likely end up cutting something. Sound is very mildly toned down from going catless. Many people think I have an off road system. Great value for the money


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Customer Reviews (75) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Full Day

Installation Cost:$250-$500

  • Performance Gain 4.212766 4.2
  • Fit 4.583333 4.6

  • 2/5

    October 18, 2016

    illegal in va

    Went to a shop but they said they couldn't put them on because they weren't marked or something.


    Year: 2003 Submodel: V6

    Helpful (1) (0)

  • 5/5

    September 02, 2016


    I returned the garage that I went to said it would be to much work and they were afraid they would damage the h pipe.


    Year: 2006 Submodel: GT

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    June 14, 2016


    Purchased these to quiet down my bassani o/r x pipe on my 02 GT, since my whole neighborhood complained everyday. They did the job and I can notice hp gains. The car sounds nice still and flies around. Extremely easy to install and I recommend them to anybody!


    Year: 2002 Submodel: GT

    Helpful (1) (0)

  • 5/5

    June 02, 2016

    Great Quality

    I have not installed these yet because im waiting for the O/R H-Pipe that i ordered with it to ship since it got put on backorder, so I will be updating this later. As for these cats, they arrived in 2 days and look great, very high quality and not a scratch or dent anywhere.


    Year: 2006 Submodel: GT

    Helpful (1) (0)

  • 3/5

    Installation Time: Less than 1 Hour

    November 22, 2015

    Questionable High Flow

    Ive had these cats installed for 6 months now, they were great at first now they have started causing CEL for catalyst system not efficient. Looking into a different brand.


    Year: 1998 Submodel: GT Gainesville, FL

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    January 27, 2012

    High flow cats FTW!!

    I have installed these because my car was way to raspy and loud as i had installed the catless Pypes off road x pipe and the Pypes Bomb Cat Back. I did not expect any performence gain as i was looking into a better exhaust note but it did. I noticed the power gain as the throttle was more responsive, the engine flows better!! It also made the sound clear and less raspy, i get looks everywere i go as it is still just loud enough >:)


    Year: 2006 Submodel: GT New Brunswick, Canada

    Helpful (2) (0)

  • 5/5

    August 10, 2011


    I am running the pypes mm system on my 07 gt and it just wasnt loud enough for me with the stock cats so I tried an off road h. it sounded awesome but a little to loud for an everyday driver so I bought these cats and welded them into my off road h and now the sound is perfect. not too quiet not too loud, awesome product


    Year: 2007 Submodel: GT

    Helpful (1) (0)

  • 5/5

    December 12, 2009

    Added to xpipe

    had headers and off road x pipe, was tood loud so added these and sounds great no loss of power


    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    March 06, 2012

    High Flowing Cats

    07 GT/CS, SLP Long Tubes, SLP X-Pipe, SLP Loud Mouths. Old cats went bad swapped them out with the Pypes cats, fit was great, they might have quieted the exhaust down while driving the DB sounded lower, but when you hit the go fast pedal the roar and snap was there!!


    Year: 2007 Submodel: Other Florida

    Helpful (3) (1)

  • 5/5

    October 13, 2010

    Absolutely no restriction

    I previously purchases JBA shorty headers, Pypes x pipe and Magnaflow Magnapacks for my 2007 4.0 mustang. I thought that with that setup my car had an awesome deep loud tone to it and sounded great when accelerating. I just had these cats put on and the difference with just simple cats is ridiculous! I thought with the setup I had before I had a sick sounding car, but once I put these on and accelerated and hell when I even turned the car on I was in complete shock I highly recommend these, its a cheap and easy way to get the best air flow out of every mustang

    John Szukis

    Year: 2007

    Helpful (21) (1)

  • 5/5

    October 02, 2009


    These are awesome, didnt lose any HP, had to throw them on bc of emission standards in GA...they sound great too!!!!!I highl recommend!


    Helpful (19) (1)

  • 5/5

    June 03, 2010

    Amazing Product

    Have to say these are the best aftermarket Cats on the market, better than the magnaflows i had on my previous car, my installer had to cut the cat pipe down and fab up new piping but def worth it, on my 04 i was even able to use the O2 bung on the cat, A MUST if you wanna stay legal and have extra power and great deep sound with flowmasters!


    Year: 2004

    Helpful (14) (2)

  • 4/5

    December 07, 2010

    Pypes Cats

    Looked for some "high-flow" cats when my stock ones died. Put these on my V6. I wasn't expecting a difference in the sound department, but these made my pre-installed Ford Racing Dual exhaust sound much deeper. I've also noticed a bit of power gain. Can't wait to Dyno to see how much. I recommend this product and I approve this message.

    Thom Corwin

    Helpful (13) (3)

  • 5/5

    October 19, 2009


    had o/r x pipe on and was too raspy. welded a pair of converters on, and the rasp went away. not to mention the cobra regained its low end torque.


    Helpful (7) (0)

  • 5/5

    February 26, 2011

    Great Product

    I have had my 2003, 3.8L for about a year now. ive done a few things to it, new transmission, clutch, and an 8.8 rear conversion. Had a nice dual exhaust setup on mine. i had stock cats, and just today my cats came in. Oh My Goodness, the big difference in sound, power, and surprize was amazing. ive actually had peope look at my car and ask me if it was a GT. Very good product, very nice employees on the phone. Very Nice setup. Thanks for everything guys!!!

    Dante T.

    Year: 2003 Submodel: V6

    Helpful (9) (2)

  • 4/5

    March 19, 2010

    Great Bang for your buck

    These cats provided a nice amount of horsepower for the money paid and also improved miles per gallon. i added them to a bassani x-pipe with flowmaster mufflers in which one of the previous cats had hollowed itself out giving a messed up reading to the O2 sensor. The sound didn't change too much, maybe a little deeper than before. The only drawback is only clamps for the front came with the kit. I had to use an adapter for the rear portion and it had to be welded. Still a great product though.


    Helpful (9) (2)

  • 4/5

    April 07, 2010

    Sweet Cats

    I cut off my 4 Old stopped up cats,,and replaced them with two of these High Flow cats with my Flowmasters, wow sounds deeper and a bit louder. I love the sound


    Helpful (5) (1)

  • 4/5

    November 13, 2009

    Nice Pypes

    They look nice under the car, and seat-of-the-pants feel is, very good, added allot more kick then I expected. One of two things either the old one's were really plugged up or I'm full of crap don't have any real numbers for comparison. Only down side I see is they seem to stick down a little further than the old ones, I'll have to watch for bottoming-out and scraping them. They look great under the car though, I did end up welding them in, I didn't use the clamps.


    Helpful (8) (3)

  • 3/5

    September 15, 2010


    bought these because i had an o/r x-pipe with slp LM2's, and they were really loud. but also too raspy and the smell was pretty bad when i was parked. put these on and really dulled the sound of my exhaust to more of a low rumble instead of a growl. and still have the check engine light on too.


    Helpful (10) (8)

  • 5/5

    Installation Time: Afternoon

    November 28, 2014

    Great Compromise Between O/R and Stock Cats

    Bought these about two years ago for my 06 GT. I was tired of loud droning exhausts that gave me splitting headaches but still wanted more volume. I had these welded in place of the stock cats on the stock H pipe and everything has worked great. They sound amazing, plenty more volume when you get on it, and mellow at idle and cruising. Don't get me wrong, when you floor it, it still screams. I ended up putting the stock mufflers back on with these, and it sounds amazing. It isn't tinny or weak sounding, it is deep and throaty and doesn't drone in the cabin at all. Surprisingly these high-flow ceramic cats and the stock mufflers may be y favorite exhaust setup for the 05-10 3v GTs. Totally worth it, and they last a long time!


    Year: 2006 Submodel: GT Montana, USA

    Helpful (1) (0)

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