Exhaust Question for the Heavies...
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Exhaust Question for the Heavies... in Cadillac CTS-V Series Forum - 2004 - 2007; ...If I run straight exhaust from the headers(cut cats)but reinstall the sensors....what will the computer do???...
  1. #1
    V-Love's Avatar
    V-Love is offline Cadillac Owners Connoisseur
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    Exhaust Question for the Heavies...

    ...If I run straight exhaust from the headers(cut cats)but reinstall the sensors....what will the computer do???

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  3. #2
    Jerseyboy is offline Cadillac Owners Member
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    Re: Exhaust Question for the Heavies...

    You will set codes for catalyst efficiency and maybe fuel trims. I've also seen this with some aftermarket catalysts as they are not as good at removing pollutants as the OE cats are. Your car will also be louder as the catalysts also act as a muffler of sorts.


    Jersey

  4. #3
    Cal
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    Re: Exhaust Question for the Heavies...

    ls1edit will probably be needed or the car will run way rich/lean I am thinking. $350 for the tune I believe, on average.

  5. #4
    V-Love's Avatar
    V-Love is offline Cadillac Owners Connoisseur
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    Re: Exhaust Question for the Heavies...

    So with a re-tune it could be done? Who do you see about computers in a car? Are there techs that specialize in this(or good books to read)? Exhaust is the first thing I would like to do.

  6. #5
    Cal
    Cal is offline Cadillac Owners Enthusiast
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    Re: Exhaust Question for the Heavies...

    Most shops will do a tune if you mail them your PCM and send it back to you, but that's not the same as dyno tuning the car. I think with that set up you NEED to take it to a tuner shop and have them do the tune.

  7. #6
    6104696 is offline Cadillac Owners Connoisseur
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    Re: Exhaust Question for the Heavies...

    Cats make a HUGE difference with noise. When I put flowmasters on my 5.0 I ran it with "open cats" instead of open headers for a little while, just out of curiosity; the car sounded pathetic. The two chamber flowmasters smoothed it right out and made it sound quite nice.

    Needless to say, there will be an emissions inspection issue if you remove the cats...unless you plan to have a "track" setup and a "street" setup........

    Doug

    On second thought, isn't the LS6 a "ULEV" engine? If so, doesn't the computer have a catalyst deterioration test program, and issue an error code (and possibly a "limp home" mode) when the computer detects a cat failure? Or does the "tune" that you refer to address this issue?

  8. #7
    V-Love's Avatar
    V-Love is offline Cadillac Owners Connoisseur
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    Re: Exhaust Question for the Heavies...

    I know nothing about computers but I figured that any sensor could easily be jumped out. I read the V gets plenty of air in but is restricted on the way out. So, I thought exhaust would be a good first project. BUT, the more I drive it the more I want to just leave it alone. Although, I like the way that 427 sounds on the 427 thread.

  9. #8
    Silver Baron's Avatar
    Silver Baron is offline Cadillac Owners Fanatic
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    Re: Exhaust Question for the Heavies...

    Check out "Exhaust Update" in this thread http://cadillacforums.com/forums/showthread.php?t=15965,
    Now you can have your cake and eat it too

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