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Factory exhaust diameter

sakis Feb 14, 2018

  1. sakis

    sakis Registered User

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    Hello all,

    I recently bought a milltek downpipe for my mk2 tt-s, however I am fitting it onto the standard cat-back and need to buy a reducer but I am not certain of the factory cat-back diameter. Some say 63.5 while others say 60mm, anyone who can confirm?(assuming it's same size as s3, if some knows otherwise please tell)

    Regards
     
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  3. Kaine19

    Kaine19 Stage 2+ S3 8P now gone. Hello 2016 RS3 :)

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    If its same size as s3 then mine was 2.34mm if i remember rightly. I did same thing as you
     
  4. nluk100

    nluk100 Registered User

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    Well it's definitely not 2.34mm lol.

    I think the differences come from inside bore diameter and outside diameter. You need a reducer to go from the 3" (?) Milltek to then slide over the outside of the catback, which IIRC is 63.5mm.
     
  5. Kaine19

    Kaine19 Stage 2+ S3 8P now gone. Hello 2016 RS3 :)

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    I meant inch lol
     

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