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Deleting my cats

This is a discussion on Deleting my cats within the Cadillac CTS-V forums, part of the Vehicle Specific category; Anybody here done this mod? I am getting my Magnaflow 16636 system installed tomorrow and I'm debating whether to have ...

  1. #1
    Junior Member
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    2005 Cadillac CTS-V

    Deleting my cats

    Anybody here done this mod? I am getting my Magnaflow 16636 system installed tomorrow and I'm debating whether to have the cats removed.

    I know the engine will throw a CEL (due to the O2 sensors).

    What else should I expect (other than a "gassy" smell and a louder exhaust note!)

  2. #2
    Its a 4 door vette bitch! JOHN_DEERE_LS6's Avatar
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    Black Raven/Ebony cowskin
    2005 Cadillac CTS-V

    Quote Originally Posted by 4DRZ06 View Post
    Anybody here done this mod? I am getting my Magnaflow 16636 system installed tomorrow and I'm debating whether to have the cats removed.

    I know the engine will throw a CEL (due to the O2 sensors).

    What else should I expect (other than a "gassy" smell and a louder exhaust note!)
    prolly see worse gas mileage.... i no whne my o2 sensors went out on my trans am my gas mileage droppe dlike crazy so if your gettin rid of your o2's you prolly see this as well.....

    or the free flowing exhasut will offset your drop in mileage thats o2 related....


    jsut my thoughts

  3. #3
    Member Z28collection's Avatar
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    black silver
    99 z28, 81 z28

    sims

    o2 simulators will work for the after cat o2's but you will still have to run the before cat o2's. i did not see any changes in fuel mileage when i did mine the only change was more power.

  4. #4
    The Bandit Wesman's Avatar
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    SGM
    1998 Trans Am WS6

    Quote Originally Posted by JOHN_DEERE_LS6 View Post
    prolly see worse gas mileage.... i no whne my o2 sensors went out on my trans am my gas mileage droppe dlike crazy so if your gettin rid of your o2's you prolly see this as well.....

    or the free flowing exhasut will offset your drop in mileage thats o2 related....


    jsut my thoughts
    Fuel economy shouldn't be affected, because he is not removing the primary O2's, only the downstream (after cat) O2's. The downstream oxygen sensors do not affect fuel economy or performance in any way, their only job is to measure catalyst efficiency by comparing its own readings to the readings of the upstream sensors.

    The primary O2's affect fuel economy, power, and driveability. OBDII cannot operate properly without them.
    1998 Trans Am WS6 SGM
    Lid, Pro 5.0, WS6 Short Stick, LS7 Clutch, TB Bypass, Detroit TrueTrac, Poly Mounts, Bilstein Shocks, LS6 Intake, SFCs, CTS-V Brake Upgrade, STB, Nitto 555's. SS Longtube Headers and True Duals w/ H pipe and Magnaflows. Tuned by Harris Speed Works. 341.4WHP/346.1 lb/ft.

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