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Confusion over downpipe/decats

Discussion in 'A3/S3 Forum (8L Chassis)' started by marlow77, Feb 14, 2013.

  1. marlow77
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    marlow77 Member

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    [Feb 14, 2013]
    Why are some of them single pipes like this

    [​IMG]


    and others' like this?

    [​IMG]

    Both apprently for S3 8L
    #1
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  3. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Feb 14, 2013]
    also look at their diameters
    #2
  4. Paradox1
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    Paradox1 Active Member

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    [Feb 14, 2013]
    Because as standard they have twin cats

    Just two different versions but either should fit.

    I dont own a S3 btw so im sure someone elsde can confirm??

    obviously the first one will flow better, the second looks like a p- shooter
    #3
  5. superkarl
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    superkarl MAN OF STEEL

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    [Feb 14, 2013]
    Second pic is just a cat for the standard downpipe.

    First pic is a whole new downpipe, with single 3 inch cat.

    The milltek cats are a complete waste of money. The standard downpipe (2 pipe design) is the downfall of the s3 exhaust.
    Hence 99% of people will get a 3inch downpipe with single 3inch cat upgrade (first pic)
    #4
  6. marlow77
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    marlow77 Member

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    [Feb 14, 2013]
    Ah rite k me dumb :sadlike: I dunno which one to go with there's pretty massive price differences...
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  7. S3 zombie
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    S3 zombie New Member

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    [Feb 14, 2013]
    Dont forget to include the fitting cost of the decat+downpipe as its not easy..i have easy decat only,easy to fit but does naff all imo..
    #6
  8. Paradox1
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    Paradox1 Active Member

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    [Feb 14, 2013]
    im dreading doing mine.........

    Think I might do it with the manifold over a weekend
    #7
  9. <tuffty/>
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    <tuffty/> Badger 5 Edition Staff Member Moderator

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    [Feb 14, 2013]
    As said, the twin cats in the second pic is to fit a std downpipe and will give you nothing for your money other than a hole in your pocket and a shiney thing where you can't see it...

    All 3" aftermarket downpipes come with either a single sports CAT or a decat section... relentless is the popular choice on this forum as its pretty good quality and very affordable comparatively... look up the Relentless K04 group on facebook for some info about them..

    <tuffty/>
    #8
  10. marlow77
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    marlow77 Member

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    [Feb 14, 2013]
    YH but they're American right? Postage must cost a bomb.

    Also, does "sports" cat mean it'll go thru MOT and "de-cat" not? What is power gained from going de instead of sport?
    Last edited: Feb 14, 2013
    #9

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