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A3 1.8T De-cat Dowpipe

Discussion in 'A3/S3 Forum (8L Chassis)' started by Jays Audi Turbo, Mar 28, 2010.

  1. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 28, 2010]
    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?
    #1
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  3. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 28, 2010]
    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/>
    #2
  4. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 28, 2010]
    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.
    #3
  5. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 28, 2010]
    See a lot of these used on Ibizas... :)

    <tuffty/>
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  6. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 28, 2010]
    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]
    #5
  7. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 28, 2010]
    It was 3inch to the flexi then went into 2.5 to fit to a blueflame exhaust system
    #6
  8. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 28, 2010]
    May also look into doing downpipes for the s3
    #7
  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 28, 2010]
    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/>
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  10. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 28, 2010]
    Yeah i can do them with a sports cat not a problem and yeah its a full stainless job no rusty mild steel **** lol
    #9
  11. dela
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    dela Member

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    [Mar 28, 2010]
    id be interested in one for the s3
    #10
  12. S3KO4
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    S3KO4 Member

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    [Mar 29, 2010]
    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!
    #11
  13. Lemon S3
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    Lemon S3 Alex

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    [Mar 29, 2010]
    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.
    #12
  14. Welly
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    Welly VX220 SC Driver :)

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    [Mar 29, 2010]
    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:
    #13
  15. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 29, 2010]
    Mine would be around same m8
    #14
  16. Welly
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    Welly VX220 SC Driver :)

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    [Mar 29, 2010]
    I'm assuming thats the one on ebay?

    I would personally go for Pipewerx. All day every day.
    #15
  17. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 29, 2010]
    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
    #16
  18. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Mar 29, 2010]
    Considering EGT's can rise to around 900 degrees under boost and make the manifold glow bright red then I would say yes :)

    <tuffty/>
    #17
  19. big_mo
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    big_mo MOSES

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    [Mar 30, 2010]
    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?
    #18
  20. Welly
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    Welly VX220 SC Driver :)

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    [Mar 30, 2010]
    Depends if you have 2 Lambda sensors or not.... I can't remember if the AUM does or not.
    #19
  21. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 30, 2010]
    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
    #20
  22. will.f_1.8t
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    will.f_1.8t Member

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    [Mar 30, 2010]
    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
    #21
  23. Imteyaz
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    Imteyaz 6th Gear

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    [Mar 30, 2010]
    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.
    #22
  24. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 30, 2010]
    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
    #23
  25. S3KO4
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    S3KO4 Member

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    [Mar 30, 2010]
    how do you guys rate relentless downpipes? there aren't many around but just want to get some ideas.
    #24
  26. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Mar 30, 2010]
    Got a link to the relentless downpipe?

    Jay id be interested in one for the S3!
    #25
  27. S3KO4
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    S3KO4 Member

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    [Mar 30, 2010]
    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.
    #26
  28. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Mar 30, 2010]
    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
    #27
  29. S3KO4
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    S3KO4 Member

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    [Mar 31, 2010]
    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?
    #28
  30. Andrew@A.L.D
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    Andrew@A.L.D Cylinder Head Master

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    [Mar 31, 2010]
    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
    #29
  31. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Mar 31, 2010]
    I'll let you know when am on with them
    #30
  32. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Apr 3, 2010]
    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?
    #31
  33. A3Tom
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    A3Tom Smell my finger.

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    [Apr 3, 2010]
    Looking good mate :)

    I could be tempted when some pennies are saved for a DP and sports cat for my AGU A3 :)
    #32
  34. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Apr 3, 2010]
    Lambda position is not so speed bump friendly is it LOL...

    <tuffty/>
    #33
  35. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Apr 3, 2010]
    Yeah i know lol, dont know who made it it was off my m8's seat and i made him a better one
    #34
  36. Jays Audi Turbo
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    Jays Audi Turbo I Love Boost :-)

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    [Apr 4, 2010]
    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.
    #35

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