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  1. #1
    Join Date
    Mar 2015
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    Phoenix, AZ
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    Default Anyone running cats?

    Have a stroked LS3 in my Camaro that runs rich. Cant seem to "tune" it out.
    Would running a cat help? Also, getting ready to run a 480HP LS3 in my truck so would apply there also. Thanks

  2. #2
    Join Date
    Jun 2010
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    Deployed
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    I have thought about it a ton of times! I had my AFR dialed in pretty well on the dyno and you still smell exhaust. They have really good high flow cats, I just need to do it!

    Quote Originally Posted by sginphx View Post
    Have a stroked LS3 in my Camaro that runs rich. Cant seem to "tune" it out.
    Would running a cat help? Also, getting ready to run a 480HP LS3 in my truck so would apply there also. Thanks
    1970 Camaro/DSE build


    Are you driver enough? Maybe....come on blue!
    https://www.pro-touring.com/threads/...71#post1147371

  3. #3
    Join Date
    Jan 2006
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    263
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    Default

    I've been running Walker highflow cats since about 2004-ish. I got tired of the exhaust smell getting on my clothes and crap like that. Also quieted down the exhaust a little which was an added benefit (at least I considered it a benefit... lol). Didn't notice any drop in power.
    See me in Camaro Performers

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  4. #4
    Join Date
    Sep 2013
    Location
    Houston, TX
    Posts
    149
    Country Flag: United States

    Default Dynatech metal-core cats

    I'm building a '72 Olds 442 convertible and decided to go with dual cats to minimize the exhaust smell with the top down. I chose DynaTech cats because they have a high-flow, metal core that won't melt down like a ceramic core if they get too hot. I called Dynatech support and the tech said the cores have 300 cells per inch and will flow 396cfm each. He also said the metal cores will light-off more quickly than a ceramic core too. Should be enough flow to support 455cid @ 6000rpm. Here's a link:

    https://www.dynatechheaders.com/stor...tic-converters
    Rodney Meyers
    72 Olds 442 Rest-mod clone

  5. #5
    Join Date
    Sep 2016
    Location
    Bakersfield, CA
    Posts
    83
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    Default

    Quote Originally Posted by cdrod View Post
    I'm building a '72 Olds 442 convertible and decided to go with dual cats to minimize the exhaust smell with the top down. I chose DynaTech cats because they have a high-flow, metal core that won't melt down like a ceramic core if they get too hot. I called Dynatech support and the tech said the cores have 300 cells per inch and will flow 396cfm each. He also said the metal cores will light-off more quickly than a ceramic core too. Should be enough flow to support 455cid @ 6000rpm. Here's a link:

    https://www.dynatechheaders.com/stor...tic-converters
    Thanks for the link. I have been contemplating this for a few years. Those look like a great way to go.
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird
    w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
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  6. #6
    Join Date
    May 2010
    Location
    kitchener,Ontario,Canada
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    1,857
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    I've always thought they were a good idea , look at the power levels the manufacturers are chucking at us now , all with cats
    Spinnin'my tires in life's fast lane

    Ryan Austin
    On twitter @raustinss
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  7. #7
    Join Date
    Feb 2007
    Location
    Joliet, IL
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    1,001
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    Default

    Quote Originally Posted by sginphx View Post
    Have a stroked LS3 in my Camaro that runs rich. Cant seem to "tune" it out.
    Would running a cat help? Also, getting ready to run a 480HP LS3 in my truck so would apply there also. Thanks
    If it's actually running too rich, adding cats will not solve that problem. Also, if it's running very rich, the cats may not last long.

    Nick ~
    1969 Cutlass

  8. #8
    Join Date
    Feb 2013
    Posts
    438
    Country Flag: United States

    Default

    Do you have O2 sensors on both exhaust branches or just 1?





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