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Downpipe and sports cat, mated to OEM centre and backbox?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by MattS3, Feb 12, 2014.

  1. MattS3
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    MattS3 Active Member

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    [Feb 12, 2014]
    As there is no gains, apart from noise, by going cat back, is there benefit of just replacing downpipe and cat, and utilising the existing pipework from cat back?
    #1
  2. nluk100
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    nluk100 Active Member

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    [Feb 13, 2014]
    Yes, I had this setup on my car for 6+ months and had massive torque gains (50Nm!).

    Ultimately it does restrict top end power but you get 90% of the gains this way.
    #2
  3. MattS3
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    MattS3 Active Member

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    [Feb 13, 2014]
    Excellent, sounds positive.
    What model car were you running it on?
    And what set up did you have? For example, does the Milltek come with a reducer to fit the cat back OEM pipe, or can one be specified from Milltek as an off the shelf part?)

    Did it drone at all?
    #3
  4. s3joe
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    s3joe Active Member

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    [Feb 13, 2014]
    If you have a look in my posts I have just had a full bcs system fitted to my s3 and it's so much better
    #4
  5. downtothebone
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    downtothebone Active Member

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    [Feb 13, 2014]
    BCS downpipe and sports cat here as well ...
    #5
  6. MattS3
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    MattS3 Active Member

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    [Feb 13, 2014]
    Joe - Just replied to your other thread.
    Downtothebone - Have you just got downpipe and sports cat? (whats the Cat back set up you have?)
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  7. downtothebone
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    downtothebone Active Member

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    [Feb 13, 2014]
    OEM cat back - yes just the down pipe and sports cat
    #7
  8. nluk100
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    nluk100 Active Member

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    [Feb 13, 2014]
    facelift S3 (3dr)

    I picked up a 100 cell MV Sports downpipe from a forum member and my garage added a reducer to suit.

    Definately no drone - you still have the OEM centre box afterall.
    #8

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