Cat delete
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2009-2014 Cadillac CTS-V Performance Mods Discussion, Cat delete in Cadillac CTS-V Series Forum - 2009-2014; Thinking of having a local shop remove the cats and just put test pipes in to stock exhaust. What kind ...
  1. #1
    jc09ctsv's Avatar
    jc09ctsv is offline Cadillac Owners Fanatic
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    Cat delete

    Thinking of having a local shop remove the cats and just put test pipes in to stock exhaust. What kind of power gains should I expect and will my car sound a lot louder??

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  3. #2
    lsxtuner is offline Cadillac Owners Member
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    Re: Cat delete

    a 12-15rwhp gain and 1.5 psi loss of boost

    Isn't a good mod unless you are running a smaller upper pulley at a minimum

  4. #3
    jc09ctsv's Avatar
    jc09ctsv is offline Cadillac Owners Fanatic
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    Quote Originally Posted by lsxtuner
    a 12-15rwhp gain and 1.5 psi loss of boost Isn't a good mod unless you are running a smaller upper pulley at a minimum
    I am running a 2.5 upper pulley a ported TB and a airaid intake.

  5. #4
    Moparman4444 is offline Cadillac Owners Fanatic
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    Re: Cat delete

    Deleting the CATs will slightly increase the sound. You will notice a 20% increase at idle or in a garage. Under normal acceleration and at cruise or highway there is very little difference. The biggest change I noticed is the increase in exhaust smell w/o the cats. I am seriously thinking about installing 100 or 200 cell CATs just to reduce the smell.

  6. #5
    baabootoo is offline Cadillac Owners Connoisseur
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    Re: Cat delete

    Quote Originally Posted by jc09ctsv View Post
    Thinking of having a local shop remove the cats and just put test pipes in to stock exhaust. What kind of power gains should I expect and will my car sound a lot louder??
    All four?

  7. #6
    jc09ctsv's Avatar
    jc09ctsv is offline Cadillac Owners Fanatic
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    Quote Originally Posted by baabootoo
    All four?
    Is there a big difference in doing all four rather than just two? Power gain or loudness or smell that I hear about??

  8. #7
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Cat delete

    Deleting CATs on a road car is a federal offense. There's a $2750 fine per CAT. Do you really want to deal with that?
    Don't mess with Binky Bear!


  9. #8
    Trapspeed's Avatar
    Trapspeed is online now Cadillac Owners Connoisseur
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    Quote Originally Posted by dkozloski
    Deleting CATs on a road car is a federal offense. There's a $2750 fine per CAT. Do you really want to deal with that?
    I've traded in cars without cats. Clearly, no one really cares about it much unless maybe you're in California.

  10. #9
    rbzstsv is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Trapspeed View Post

    I've traded in cars without cats. Clearly, no one really cares about it much unless maybe you're in California.
    I have done the same in Wisconsin and Illinois without issue.

  11. #10
    1800bigk is offline Cadillac Owners Member
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    Re: Cat delete

    What about the check engine light, is there a way to tune the ecu to ignore the secondary O2 sensors? I usually run my cars no cats as well but I hate seeing that light.

  12. #11
    rbzstsv is offline Cadillac Owners Fanatic
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    Yes.

  13. #12
    baabootoo is offline Cadillac Owners Connoisseur
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    Re: Cat delete

    I'd remove, or gut, the second set first and see how you like it. Then, you're still legal...........looking

  14. #13
    jc09ctsv's Avatar
    jc09ctsv is offline Cadillac Owners Fanatic
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    Quote Originally Posted by baabootoo
    I'd remove, or gut, the second set first and see how you like it. Then, you're still legal...........looking
    Will there be any power gain or drop in boost by just losing the second set or will it be just for sound?

  15. #14
    Moparman4444 is offline Cadillac Owners Fanatic
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    Re: Cat delete

    If you gut the second set of CATs you will get more resonance. you would be better off just eliminating the entire center section of pipes and replace them with mandrel bent pipes instead of the crimped pipes.

  16. #15
    Mikevette is offline Cadillac Owners Fanatic
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    Re: Cat delete

    I have done what MOPARMAN 4444 suggest on all 3 of my V's and like the results!! you get the deeper sound at idle and WOT, you don't have to look at those crimped pipes anymore when you change your oil. Cost about $100 bucks at any quality muffler shop, takes about an hour to remove bend and re-weld new spacer pipes. I have pic's of the finished product if needed.

    Mike P.

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