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1.8T downpipe+decat?any good?

Discussion in 'A3/S3 Forum (8L Chassis)' started by sam_20vturbo, Feb 1, 2007.

  1. sam_20vturbo

    sam_20vturbo Member

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  3. Prawn

    Prawn My other car is a MINI!!!!

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    from what ive picked up about these on this and other forums, if you have an older AGU engine it will work ok, as they only have one lambda i think, the newer DBW engines also have a post cat lambda i think, and will throw up fault codes and some sort of light on the dash.

    as to what gains are available, im not sure, but id be interested to know, as i have seen them too, and would like to know if its worth doing!
     
  4. Booth_S4

    Booth_S4 Riding on V8 power

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    shame really, would fit an S3 as it has 2 pipes into one at the cat!

    Not really sure whether or not you would see an increase in performance but you will defo notice a big increase in noise!
     
  5. sam_20vturbo

    sam_20vturbo Member

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    how will i know if i have an older AGU engine? ive got a 1998 1.8t sport...?
     
  6. portsA318T

    portsA318T 'The boat can leave now, tell the crew'

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    Have a look at the sticker in the engine bay. Thats if it still has it. The engine code should be written on that.
     
  7. sam_20vturbo

    sam_20vturbo Member

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    but then how will i know once ive got that? sorry im pretty clueless about the whole thing lol

    and also how do i know if mines a facelift model or not? :blush:

    Sam
     
  8. portsA318T

    portsA318T 'The boat can leave now, tell the crew'

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    I was wrong there. My sticker in the engine bay doesn't say what engine code it is. Sorry. However it was in my logbook. What year is your car and model?
     
  9. M44 DUB

    M44 DUB Member

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    You'll have a pre-face lift model same as mines
     
  10. sam_20vturbo

    sam_20vturbo Member

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    its a 1998 A3 1.8 T sport. I think its early 1998 as the cd changer ive just had top buy for it is a pre 1998 fitting.

    Sam
     
  11. portsA318T

    portsA318T 'The boat can leave now, tell the crew'

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    I have a 98 T Sport as well and its an AGU engine.
     
  12. daz2347

    daz2347 Member

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    should be a AGU vag changed them mid 2000. pipe works well had one on my old 1.8 gti the only problems is they boom a bit if sitting on the motorway at 60-80 you will soon get peed of with it.
     
  13. brucelee1973

    brucelee1973 New Member

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    Got a 210 BHP S3 on a 2000 plate, Do you know if this will fit
     
  14. Tallpaul

    Tallpaul Member

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    No, the one in the link won't fit a K04 turbo or a quattro equiped S3.

    Anyway, you'll fail your MOT without a CAT.

    Also, as mentioned, wide-band lambda equipped cars will throw a fault code and probably mess up the air:fuel ratio unless mapped for the decat.
     
  15. Prawn

    Prawn My other car is a MINI!!!!

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    sorry to bring up such an old post. but i thought it was far better than starting a new one!

    has anyone actually got any experience with a decatted AGU engine? is the standard cat actually restrictive at all?

    im having my car remapped in a month, the mods when its remapped will be a miltek catback stainless exhaust, CAI, and a forge DV. would it be worth me decating the car as well? i know its an MOT failure, but would the benefits be worth the hasstle of refitting it once a year for MOT? or is it simply a bad idea and not worth it?
     
  16. PocketRocket

    PocketRocket Member

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    Without cat should help a bit at high revs, but better is to put a 2.5" or 3.0" DP with high flow cat, and avoid pollution:yes:

    What is MOT?
     

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