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A3 1.8TQ cats

Discussion in 'A3/S3 Forum (8L Chassis)' started by Pontio, Aug 2, 2005.

  1. Pontio
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    Pontio Member

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    Hi every1,
    As said in the title i would like some info about these cats, it has been stated and proven by some ppl on here that the S3's cats are not restrictive, what i would like to know is what about the cats in question? i am hoping they are the same so i will not have to change them myself..
    Thanks for any help
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  2. Drill
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    Drill Member

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    Not sure if the cats themselves are the same, but the TQ and the S3 both use dual cats which I think is where the reduced restriction comes from /ubbthreads/images/graemlins/crazy.gif

    /ubbthreads/images/graemlins/beerchug.gif
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  3. Drill
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    Drill Member

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    OK, engine codes ARX & ARY use part # 1J1 131 701 DX
    BAM & AMK: 8N0 254 400

    Don't forget though, the K04 has a different orientation than the K03, so the downpipes (Which bolt straight to the cats) are different (and larger diameter on S3)

    HTH /ubbthreads/images/graemlins/beerchug.gif
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  4. Pontio
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    Pontio Member

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    damnit.. not what i wanted to hear :-( hopefully there not restrictive and i dont need to change them..
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  5. Drill
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    Drill Member

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    Well, they COULD be the same cats, and just the "Y" pipe is a different diameter /ubbthreads/images/graemlins/crazy.gif Does that help /ubbthreads/images/graemlins/angel.gif

    /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/beerchug.gif
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  6. Pontio
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    Pontio Member

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    lol, ye. thanks for the info anyhow.
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  7. ANDYTQ
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    ANDYTQ Member

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    Front end on tq very resistrictive,i have some photos somewhere of the front pipe and cats,frontpipe diameter very small s3 is much bigger.I fitted a custom 2.5 inch frontpipe and race cat,pick up seems much better and i think torque has improved too. /ubbthreads/images/graemlins/beerchug.gifAndy
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  8. olekvi
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    olekvi Member

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    [ QUOTE ]
    Front end on tq very resistrictive,i have some photos somewhere of the front pipe and cats,frontpipe diameter very small s3 is much bigger.I fitted a custom 2.5 inch frontpipe and race cat,pick up seems much better and i think torque has improved too.


    [/ QUOTE ]

    I've changed from stock A3 TQ to 3" downpipe and racecat. The car is a bit more responsive, but I you're going to run stock turbo it really isn't worth the money IMHO.
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  9. Pontio
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    Pontio Member

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    well im wanting to go the ihi route so i'll ask jabbasport what they think..
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  10. Ryanc
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    Ryanc Active Member

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    You need a sports cat with the ihi kit otherwise you will melt the stock cat.My 100 cell race cat passed the mot easily.
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  11. KEF A3 20V T
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    KEF A3 20V T Turbo's Rule

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    will an s3 dual cat fit onto a 1.8t fr?? will it be able to cope with tuning up to bout 270/ 280 bhp ish?? was thinking of putting a k04 turbo on so will need different dp neway so if the cats wil phisically fit under the car al just use oem parts!
    #11

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