To De-Cat or Not..

Discussion in 'General Technical Discussion' started by naughtika, Aug 5, 2007.

  1. naughtika

    naughtika OzVR4 Stalker Moderator Trader

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    Hey guys.. I know removing the Catalytic Converters are illegal in Oz.. but with our cars can it pass the emission test if we are to remove it?

    Brad & Gly - has it been done?
     
  2. hawks

    hawks Leaving Skid Marks

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    Dunno, but is probably not worth the fine if you get caught !
     
  3. leebutts

    leebutts 1 AYC Bar

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    I'm going to go for a high flow cat instead of removing it.
    I don't want to waste good money on fines when I could spend it on go fast bits :)

    Lee
     
  4. bradc

    bradc 1 AYC Bar

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    It does make the car go a bit better, especially at the top end, I don't know what the laws are like over there, but here you can remove the cat without a problem :)
     
  5. Kristian

    Kristian Leaving Skid Marks

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    1) You will never ever pass an emissions test without it.
    2) The fine is issued by Dept of Environment and Heritage, not Dept of Transport, and can be anything up to $10,000...
    3) A decent high-flow cat would have a negligible effect on performance.
     
  6. Gly

    Gly Guest

    personally if we had emmissions laws over here,
    (which we dont, so i dont have one)

    i would fit a high perfromance cat....

    the boys in the UK have had great success with them,
    better than the factory ones, and lower emmissions...

    cat's only have a limited life span anyway, probabilly should be replaced after 5 years? or 80000km i beleive?
     
  7. mitchy

    mitchy Leaving Skid Marks

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    what he said.
     
  8. VR-04-TT

    VR-04-TT 1 AYC Bar

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    There's no way in hell you'll pass an emissions test without it. If you could...they wouldn't fit them would they? lol :p

    Mitsu seem to fit decently flowing cats from the factory, their only issue is the diameter of them. But I was running the stock 2"(2.25"?) cat on my magna which had a 2.5" exhaust otherwise with custom extractors etc and there were no restriction issues that warranted getting a high flow. But, of course, the galants could be totally different.
     
  9. jmo

    jmo Guest

    Decating would also make the exhaust even louder, i know of a few guys that want to quiet down their exhausts, Droning is not cool kids.

    The only reason i would decat a car now is if i was going to track it
     
  10. anthony

    anthony Leaving Skid Marks

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    would fitting a decat also increase fuel consumption?
     
  11. Gly

    Gly Guest

    no, it shouldnt change, very minor improvement if anything
     
  12. joe

    joe Guest

    maybe you can find a second hand stock cat, gut it and put it on your car. when you get done by epa put your stock one back on , do the test and your home free..
    if you get caught i didnt say anything.lol
     
  13. bradc

    bradc 1 AYC Bar

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    Anthony - because there isn't an additional O2 sensor after the cat there will be minimal change either way due to the less restriction, not due to the ecu tuning it differently.
     
  14. Richard__

    Richard__ Leaving Skid Marks

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    Hey guys, bringing this thread back for a minute. I know for some of you it's illegal to remove the cat where you're from, here we do not have emissions testing or anything like that.
    Question is if I were to get an exhaust shop to remove the cat section, will I get an engine light? I run a straight pipe on my BRZ and when I removed the cat I had to change the tune to remove the light.
    Also, how much louder will the Legnum get roughly? Will it sound okay, or really drone?
    Thanks!
     
  15. Mattalot

    Mattalot Hesitantly Boosting Premium Member

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    Can't say for noise as mine hasn't left the driveway in a month...

    But you wont get a engine code as there's no sensors after the cat.

    Can't get a code if there's no sensors after it to detect a change.
    Same goes for any car.
     
    Richard__ likes this.

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