75 eldo catalytic convertor

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500, 472, 425, 368 Discussion, 75 eldo catalytic convertor in Cadillac Engine Discussion; My cat is clogged up, i know because i was able to unbolt the pipe where it comes off the ...
  1. #1
    nphoenix is offline Cadillac Owners Member
    Automobile(s): 2004 deville
    Join Date
    Nov 2004

    75 eldo catalytic convertor

    My cat is clogged up, i know because i was able to unbolt the pipe where it comes off the Y fitting.

    it sounds so sweet w/o a muffler, so in replacing the cat i am thinking to add two cats and do true dual exhaust.

    it seems like it can fit.. anyone do this?

    ALSO i never had a cat on this car until i move to AZ and i swear the pipes looked stock before it was tacked in line. I also saw some undersides of a 1975 on ebay and they dont have cats either.

    Emissions insist have cats. All i can resarch is 1975 forward - but can not find definatively all 1975 cars need it.

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  3. #2
    drmenard is offline Cadillac Owners Connoisseur
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003

    Re: 75 eldo catalytic convertor

    All 75's came with cats... If they are just looking to see if you have a cat and not sniff the tailpipe, you can take out the plug in the bottom of the cat and take out the pellets inside and put the plug back..
    What I did ounce was take a muffler the same size as the cat and cut the two bent pipes off the cat and weld them on the muffle rso it fit right in and looked stock...

  4. #3
    intragration's Avatar
    intragration is offline Cadillac Owners Fanatic
    Automobile(s): 1970 Coupe DeVille, 2002 Eldorado Collector Series
    Join Date
    Feb 2008
    Northlake, IL

    Re: 75 eldo catalytic convertor

    I can't believe they would actually sniff a '75. Anyway, they make hollow catalytic converters, and I'm pretty sure that by using the typical emissions cheats that you could pass the test without a functioning cat. How strict could the standards really be for a 36 year old car with a 500 cubic inch engine??

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