Can I remove My Cat On my Deville?
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View Poll Results: Remove the Catalytic Converter?

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  • Definitly NO

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  • Yes

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  • You can, But I don't Suggest it.

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Can I remove My Cat On my Deville? in Past Cadillac Vehicle Discussion; Alright, My cat Is makin some raddling noise and I was curious to see if I can remove it. I ...
  1. #1
    Ville94 is offline Cadillac Owners Member
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    Can I remove My Cat On my Deville?

    Alright, My cat Is makin some raddling noise and I was curious to see if I can remove it. I honestly believe I can't But I wanna here from you guys if I can or can't. I know I have a positive feed-back EGR system that Relies On Backpressure! But I didn't know if anyone has done it before and has some good or bad results!? I appreciate this ahead of time everybody. Thanks!

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  3. #2
    Rodya234's Avatar
    Rodya234 is offline Cadillac Owners Connoisseur
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    Re: Can I remove My Cat On my Deville?

    You can do whatever you want, however, removing a cat without putting a new one on is a FEDERAL OFFENSE. I have gutted a cat on my car because these cars are no longer emissions tested in Illinois, but if you live in a state where emissions are tested, you can get in some trouble for not having one.

    You gain about 5hp from removing one, a little bit better fuel economy and a more aggressive exhaust note, but other then that nothing really changed.

  4. #3
    Ville94 is offline Cadillac Owners Member
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    Re: Can I remove My Cat On my Deville?

    With your 4.9L Does it have the same EGR system as mine? I live in florida, we did just sign over to the New California Emission. Except its for only those 2006 and up that have to meet those standards. Mine is "Grandfathered In". I am just afraid to remove the cat Or Gut it if its going to hurt the action of my EGR?

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    Rodya234's Avatar
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    Re: Can I remove My Cat On my Deville?

    If your car has to be emissions tested in any way, it will fail without a cat converter. Removing the cat hasn't noticeably effected my EGR, and our engines should be nearly identical, but the pipes on a '94 Deville were straighter, and therefore make less back-pressure then mine do, so your effects may be different. The only way to find out for sure is to try though.

    Here's the difference between my exhaust and your's:

    '91-'93:

    '94-'95:

  6. #5
    Brizzal's Avatar
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    Re: Can I remove My Cat On my Deville?

    yea ive been thinking of getting rid of my cat also, im sure mine is going being 14 years old with 114k on it

  7. #6
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    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: Can I remove My Cat On my Deville?

    Florida doesn't have emissions testing.

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    Re: Can I remove My Cat On my Deville?

    Quote Originally Posted by Playdrv4me View Post
    Florida doesn't have emissions testing.
    exactly!

  9. #8
    Rodya234's Avatar
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    Re: Can I remove My Cat On my Deville?

    Quote Originally Posted by Playdrv4me View Post
    Florida doesn't have emissions testing.
    Oh, then by all means, you guys can go ahead and start removing some.

  10. #9
    Ville94 is offline Cadillac Owners Member
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    Re: Can I remove My Cat On my Deville?

    Yeah, there arent any testing requirements in florida. The only thing they require is that everything 06 and Newer has to meet the requirements of its emissions. During standard servicing they will be looking. It hasn't started yet though. . . .

  11. #10
    Ville94 is offline Cadillac Owners Member
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    Re: Can I remove My Cat On my Deville?

    Alright, another question. . . Still about the exhaust system. Has anyone put a muffler on their cadillac yet? I am curious if I can and If it will sound good? My intensions are to put on a Flowmaster 40 Series or borla or even a magna Flow. Any ideas?

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Can I remove My Cat On my Deville?

    I would skip the dronemaster 40 and go with the Borla. I have only heard a couple magnaflows and they sounded nice too.

  13. #12
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    Re: Can I remove My Cat On my Deville?

    I used to do that on my performance cars. That was before I cared about the enviornment. Even though we don't have emissions testing it is still wrong. You wont gain any real performance other then the approx. 5hp, so why do it? If you want the 5 hp, at least put on a high performance cat and a cat back system, and feel good that you are not hurting the enviornment!

  14. #13
    Rodya234's Avatar
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    Re: Can I remove My Cat On my Deville?

    ^One volcano (of which the earth is covered with) can produce more co2 and other emissions in 10 minutes then your car would ever.

  15. #14
    Ville94 is offline Cadillac Owners Member
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    Re: Can I remove My Cat On my Deville?

    I plan to put a muffler on there... As for the cat I will probably be putting a factory one back on here.... No worries for that. but I just want a good tone outta the exhaust... I HATE quiet. lol

  16. #15
    hendrob is offline Cadillac Owners Fanatic
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    Re: Can I remove My Cat On my Deville?

    Bear in mind also that if you do remove you cat, your exhaust is going to stink like hell. VERY noticible difference.

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