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A3 1.8T De-cat Dowpipe

Jays Audi Turbo Mar 28, 2010

  1. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    What gains would i get from a de-cat downpipe with full 2.5 system, i have my own fabrication business and i have a jig for making the downpipes etc i have about 18 of the flanges made already i've made 2 downpipes already and sold them, would anyone be interested in them and what would be best, 3inch bore then reduced down to 2.5 or just 3.0 then get a full 3 inch system am going for a 3 inch cone from the flange to the flexi then 2.5 pipe work.

    Peoples views and gians from fitting?
     
  2. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Don't see much in power gains fitting kit like this but helps the engine by reducing EGT's and arguably helping the turbo spool more quickly...

    Worth while addition if you plan to go stage 2 with complimentary mods like a FMIC, panel or cone filter etc..

    Should get a lot of interest at the right price... got any pics of you previous work?

    <tuffty/>
     
  3. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Well i have a fmic awaiting fittment, am gonna be getting a forge dumpvalve,forge intake pipe,induction kit behind front bumper,ecotek valve,de-cat pipe and full cat-bk system then a re-map,
    For a 2.5 de-cat downpipe £210 Delivered and for a 3.0 de-cat downpipe £260 Delivered.
    I'll try find pic of the downpipe i did for my m8's seat ibiza cupra.
     
  4. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    See a lot of these used on Ibizas... :)

    <tuffty/>
     
  5. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Here's the one i made for my m8's seat, i've done 5 so far for the ibiza and 2 for the a3
    [​IMG]
    [​IMG]
    [​IMG]
     
  6. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    It was 3inch to the flexi then went into 2.5 to fit to a blueflame exhaust system
     
  7. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    May also look into doing downpipes for the s3
     
  8. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Looks good mate... I assume its all stainless... would also suggest a 200 cell CAT option as come MOT time etc... :)

    Magnaflow do some nice small 200 cell cats, I got one for mine... very neat

    <tuffty/>
     
  9. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Yeah i can do them with a sports cat not a problem and yeah its a full stainless job no rusty mild steel **** lol
     
  10. dela

    dela Member

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    id be interested in one for the s3
     
  11. S3KO4

    S3KO4 Member

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    On the same topic, do you guys think heat wrap is needed for standard KO4 mapped, using the 3" DP etc.. or there is no need for this! and how do you rate XS power downpipe and 120 cell cat? just some info as I am not sure what to look at the moment!
     
  12. Lemon S3

    Lemon S3 Alex

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    I might be interested but the price is a bit high for me as you can get a pipe werx DP n decat for £300.
     
  13. Welly

    Welly VX220 SC Driver :)

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    I was very pleased with the spool time difference when I fitted my DP and Decat to my old A3.

    I got one from some company or other in Belgium, and wasn't expensive at all. Only around £150. Bargain. Good mods for the money. :icon_thumright:
     
  14. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Mine would be around same m8
     
  15. Welly

    Welly VX220 SC Driver :)

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    I'm assuming thats the one on ebay?

    I would personally go for Pipewerx. All day every day.
     
  16. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    I would'nt get any thng off ebay cause half the time something is missing or dont fit right, like other lad said pipewerx would be better
     
  17. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Considering EGT's can rise to around 900 degrees under boost and make the manifold glow bright red then I would say yes :)

    <tuffty/>
     
  18. big_mo

    big_mo MOSES

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    I have been looking at de-cats and diffrent down pipes for my A3. If i got a de cat would that bring up a fault as well as the light on the dash?
     
  19. Welly

    Welly VX220 SC Driver :)

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    Depends if you have 2 Lambda sensors or not.... I can't remember if the AUM does or not.
     
  20. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    I have one and its before the cat lol but if you have 2 i think you can still get away with it as the one i made for my m8's seat ibiza has 2 sensor's one before and one after the cat and no lights have come up yet and his had it on for about 5-6 months
     
  21. will.f_1.8t

    will.f_1.8t Member

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    i also would be interested, but that is a little pricey for a decat, could you give me a price for one with a cat. will need the two lambda sensors also for an AUM!

    cheers
     
  22. Imteyaz

    Imteyaz 6th Gear

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    Decatting on an AUM will bring up DTC but there are ways around it...

    Get yourself one of these: http://store.blackforestindustries.com/oxsesp.html

    I'm sure someone here (UK) could make one at little cost, that should stop the lights however I couldn't tell you if it will pass an emissions test when it comes to MOT's.
     
  23. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Its a full downpipe de-cat that comes with gasket and nuts for £220 Delivered which is a good price and for a sports cat £320 Delivered
     
  24. S3KO4

    S3KO4 Member

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    how do you guys rate relentless downpipes? there aren't many around but just want to get some ideas.
     
  25. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Got a link to the relentless downpipe?

    Jay id be interested in one for the S3!
     
  26. S3KO4

    S3KO4 Member

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    no link sorry, I read some guy fitted one late last year and he was really happy with it, but heard something like droping the sub frame to fit it ?? this could be a bit of pain.
     
  27. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    The Relentless down pipe for the S3 is a poor fit and need modifying

    The flange is wrong and needs re drilling and the flange also needs trimming

    The co sensor sits close to the manifold
     
  28. S3KO4

    S3KO4 Member

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    you mean trimming from the thickness or the sides? is O2 sensor close enough to touch the mani that can get annoying? have you personaly fit one or had one?
     
  29. Andrew@A.L.D

    Andrew@A.L.D May add NOS to 600+bhp S3.

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    Off the Side

    The Sensor is about 1mm away from the manifold

    I've just fitted one for someone, the ret off the down pipe is good
     
  30. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    I'll let you know when am on with them
     
  31. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Here's a old de-cat pipe of a mk3 seat ibiza cupra dont know who made it but it is pants, i took my old one off was not a bad job just a little tricky to get to bolts etc and theres no need to drop sub frame even if you have 3inch bore.

    Old one off 3inch seat ibiza downpipe and it fits like a glove just a bit close to heat shield.
    [​IMG]
    [​IMG]
    [​IMG]

    I think i might go 3inch with jetex middle box and back box then get remap etc?
     
  32. A3Tom

    A3Tom Smell my finger.

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    Looking good mate :)

    I could be tempted when some pennies are saved for a DP and sports cat for my AGU A3 :)
     
  33. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow... Staff Member Moderator Audi S3

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    Lambda position is not so speed bump friendly is it LOL...

    <tuffty/>
     
  34. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    Yeah i know lol, dont know who made it it was off my m8's seat and i made him a better one
     
  35. Jays Audi Turbo

    Jays Audi Turbo I Love Boost :-)

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    People with 3' system's what boxes would be best as i dont want silly loud am gonna have 3' downpipe de-cat, then i was thinking of 2x jetex boxes, both of them 250mm long or just one and a middle box 625mm long.
     

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