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

Item 20105
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Market Price $374.99 You Save 12% ($43.31)
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$331.68 (pair)

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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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 -


      Customer Reviews (19)

      Write a Review

      Ratings Summary

      4.1 out of 5 overall rating from 19 customers

      Installation Time: Full Day

      Installation Cost: $100-$250

      • September 06, 2018

        5 2007 GT - TylerL Installation Time: Less than 1 Hour

        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.

        Helpful (2)
      • August 01, 2018

        5 2000 GT - Carlos Installation Time: Shop Install

        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.

        Helpful (2)
      • July 29, 2018

        5 2006 GT - whipplecharged Installation Time: Afternoon

        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

        Helpful (3)
      • March 31, 2018

        5 2006 V6 - Ethan Installation Time: Less than 1 Hour


        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.

        Helpful (5)
      • March 25, 2018

        5 1998 V6 - DJ Installation Time: Shop Install Installation Cost: 0-$100

        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!

        Helpful (4)
      • January 18, 2018

        1 2007 V6 - Bravo91

        Went bad in a couple of weeks

        Would highly recommend to stay away from this brand.

        Helpful (8)
      • July 15, 2017

        5 2003 Cobra - JimB

        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.

        Helpful (5)
      • June 08, 2017

        5 2006 GT - LawrenceC

        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!!!!

        Helpful (6)
      • March 10, 2016

        1 2009 GT500 - 600hpGT500 Installation Time: Shop Install Installation Cost: $100-$250

        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.

        Helpful (8)
      • July 17, 2015

        4 2006 GT - Larryv Installation Time: Shop Install Installation Cost: $100-$250

        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.

        Helpful (7)

      Questions & Answers (12 answers)

      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)

      Can BAMA tune for these?

      • Bama can tune for these cats.

      Helpful (1)

      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)

      What kind of tuner would I need?

      • A custom tune is required to use this product.

      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)
      Post Your Question
      7 More Questions
      Is there any drawback if I install this on a naturally aspirated Mustang? Later I would go for a supercharger. 1 answer
      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (2) Catalytic Converters

      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

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