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anyone running a large bore downpipe and decat on there S3 ?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by jonny1985, Apr 13, 2013.

  1. jonny1985
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    jonny1985 Member

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    As above is anyone running a large bore downpipe and decat on there S3 ? Are they super loud ? And what happens with the lambda sensors ?
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  2. elrao
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    elrao Member

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    Am sure there are, I had a de-cat on my TT - was a pain at MoT time, until I got introduced to a friendly MoT man!

    You usually need a remap that removes the error you get when your cat fails.
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  3. jonny1985
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    jonny1985 Member

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    Yeh suppose that's the down side to a decat , mot time . Would there be much difference in performance between decat and sports cat if car was at stage 2 ?
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  4. S3AMK20VT
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    S3AMK20VT Member

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    Sound mega fun! I got milltek turbo back decat non-res. lambda sensors go back in
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  5. jonny1985
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    jonny1985 Member

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    So just go back in and no faults . Obv would need mapping to suit
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  6. big harty
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    big harty Member

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    Yep. Sounds great and not too loud. Unless you hit the gass pedal hard. :p
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  7. S3Alex
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    S3Alex Rarely neutral

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    Yes.

    It's not too loud unless you have either a backbox delete,or centre box( non-resonated) exhaust.

    P.S.....you don't need a decat until you're at Stg3 or above.
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  8. jonny1985
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    jonny1985 Member

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    Cool . I am not wanting huge power like your car Alex just somthing with a nice amount of poke lol . So no higher than stage 2+ . So would a sports cat be fine
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  9. coreythorny
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    coreythorny Member

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    Are you thinking of fitting to the standard cat back?
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  10. R34nel
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    R34nel Member

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    I've got milltek resonated with decat and it is only a touch louder than standard, I had the non res before and I didn't like it, not so much really loud but very boomy
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  11. jonny1985
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    jonny1985 Member

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    Nope when I do the exhaust it will be done all the way to the turbo and all at once .
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  12. jonny1985
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    jonny1985 Member

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    Yerh that's what I don't want booming. Ah that's what I was thinking of res with decat . But will probs just go sports cat and non res

    Its a shame the standard exhaust wasn't stainless steel as I think it makes a nice sound lol
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  13. S3Alex
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    S3Alex Rarely neutral

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    Stock exhaust sounds OK,but it's quite restrictive.
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  14. R34nel
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    R34nel Member

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    yeah I have to agree I also thought the stock system sounded alright
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  15. DJ-S3
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    DJ-S3 Member

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    Me. Got it mapped out. Love the sound of my Milltek.
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  16. jonny1985
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    jonny1985 Member

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    Yeh thourt so
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  17. pinterovski
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    pinterovski Member

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    Here is mine Supersprint back box and fi76mm custom downpipe. Decate Non Res:p
    Last edited by a moderator: Aug 15, 2014 at 12:29 PM
    #17
  18. R34nel
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    R34nel Member

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    I want that supersprint jobby! why are their prices so unrealistic?
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  19. coreythorny
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    coreythorny Member

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    You seem that lad on VXRo who makes exhausts etc? His names Adam from Lincoln.
    I might be getting him to make me one after July unless I see a miltek etc for a good price.
    #19
  20. R34nel
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    R34nel Member

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    I've just sold a milltek non res cat back you could have had that and just bought a downpipe to go with it, but I never thought
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