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Thread: decatting

  1. #1
    Jay
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    decatting

    Is it possible to remove the cat from the standard 1.8t A3 exhaust?
    Are there any benefits of doing this?

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  3. #2
    <tuffty/>'s Avatar
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    In short...
    Yes and not really

    Get a 3" downpipe and 200 cell cat instead...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  4. #3
    S3 Paul's Avatar
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    I want a 200 cel cat to fit with my 3 inch downpipe ... any ideas???
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  5. #4
    Prawn's Avatar
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    Jay, I'm guessing as it's a 5 door it'll be an ARZ or AUM engine? if so, then you'll have a post cat lamda, which won't like the lack of cat and throw an engine light.

    if it's an AGU engine, then you can decat it just fine.

    It's all very well saying get a downpipe and sports cat, but at 100 for a 3'' DP/decat, vs 450+ for a milltek dp/sports cat, I think it's worth a bit of hasstle once a year come MOT time
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  6. #5
    Pete20vt's Avatar
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    Quote Originally Posted by tufftybloke View Post
    In short...
    Yes and not really

    Get a 3" downpipe and 200 cell cat instead...

    <tuffty/>
    What he said, good power gains with no engine light/MOT trouble.
    FOR SALE: 2003 RED Audi S3 - 73k - MINT - Custom-Code - Black Leather - £6600

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    SamiG's Avatar
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    My 210hp S3, does this have a post cat o2 censor?? As a local garage do my MOT's so i have no trouble MOT'ing it and would rather use a decat pipe over a sports cat if possible?

  8. #7
    S3 Paul's Avatar
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    I think the noise from a decat'd 3 inch down pipe at full chat is great but... Vosa have pulled me twice. Its a pain in the arse.
    I want to fit a sports cat into the decat section of the downpipe... looking as we speak
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  9. #8
    Speedy Steve's Avatar
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    Its not the mot you want to worry about its the road side inspection! You dont really gain anything from decatting other than saving money just go for the Pipewerx DP and cat
    Ive been Badger 5'd

    Can we break the magic 300?????? In a word Yes 314 BHP 249 lbft at Badger 5

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    steves is way quicker than any stock turbo'd s3 i have driven
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  10. #9
    S3 Paul's Avatar
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    my down pipe is a pipewerx item but it came to me cheap but was the decat version.
    The MOT isnt realy a problem ... most people know somebody who know somebody but mr vosa doesnt give 2 hoots if you have an mot... he does care that there is no cat under the car .
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  11. #10
    SamiG's Avatar
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    Yeah but there's not an awful lot they can do about it other than send you to an MOT approved garage to have it tested and fixed with a certificate which you will have to present to the police within 7 days i think. And it's the same scenario, if you know someone who knows someone you're pretty sorted.

    And how often is it you have VOSA doing checks on your vehicle? And why are you in that position in the first place??

  12. #11
    Chugger

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    do they just do a visual inspection? or emissions test? Iv heard of decatted cars of a certain age still being within the limits even with a decat. This is why im not bother decatting and no way paying for a sports (pussy) cat, unless mine goes.

    I once read that it cause more harm manufacturing catalytic converters then they will ever help stop. Dunno if this is just conspiricy theory or not
    57 A3 2.0 TDI Sportback (140)

  13. #12
    Jay
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    What exhaust options are there for the AUM engine. and what sort of prices am I looking at?

    I've seen 3" downpipes start from 100 upto 500. Whats the difference between them?

    cheers

  14. #13
    Chlippo's Avatar
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    any links to the DP and cell cats u are talking about?

  15. #14
    S3 Paul's Avatar
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    Quote Originally Posted by SamiG View Post
    Yeah but there's not an awful lot they can do about it other than send you to an MOT approved garage to have it tested and fixed with a certificate which you will have to present to the police within 7 days i think. And it's the same scenario, if you know someone who knows someone you're pretty sorted.

    And how often is it you have VOSA doing checks on your vehicle? And why are you in that position in the first place??
    Erm... ive been made to take the car to a VOSA main garage to have the emisions and cat function tested... if it fails the car is deemed ilegal to be used on the road... Not just the get it signed by a friendly mot man to sort it,
    Vosa inspections are not un heard of and they will become more common place .
    Why am i in what position ??
    Noggy Blue 2001 S3

    I ask questions because i change my mind so much. If i ask questions you have already covered... just leave it be?

  16. #15
    <tuffty/>'s Avatar
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    Quote Originally Posted by S3 Paul View Post
    I want a 200 cel cat to fit with my 3 inch downpipe ... any ideas???
    I used a Magnaflow one...

    http://www.magnaflowshop.com/index.p...roducts_id=769

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  17. #16
    Chlippo's Avatar
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    Is it the same for the audi TT?
    audi TT products are more availabe here at this side of the world lol

  18. #17
    SamiG's Avatar
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    Quote Originally Posted by S3 Paul View Post
    Erm... ive been made to take the car to a VOSA main garage to have the emisions and cat function tested... if it fails the car is deemed ilegal to be used on the road... Not just the get it signed by a friendly mot man to sort it,
    Vosa inspections are not un heard of and they will become more common place .
    Why am i in what position ??
    Wow this happened to me once, VOSA checked my car and done an emissions test, it failed as it was decatted and they gave me a producer to get it fixed within 7 days. I know a lot of people that have had this recently but never heard of what you experienced?

    Guess the cops/VOSA are different in defferent areas etc

  19. #18
    h100vw's Avatar
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    Quote Originally Posted by Chlippo View Post
    Is it the same for the audi TT?
    audi TT products are more availabe here at this side of the world lol
    8N 225hp/165kw models have the same downpipe/cats as the 8L S3.

    Gavin
    Delivering Custom-Code to Australians. www.custom-code.co.uk

  20. #19
    Prawn's Avatar
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    interesting read.....

    I've only ever seen the VOSA roadside checks once, and wasn't stopped, didn't realise it could be that severe!

    my old AGU actually got through an emissions test without a cat at all, but apparently they had to get it red hot to do so, not sure how this works though to be honest.....
    -------------------------------------------------------------------------------------------------

    Prawns TFSI Turbo'd 1.8T Track Car

    But I know nothing so ignore me.

 

 

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