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Downpipe flange bolt to bolt diameter, can anyone help?

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  • #1

    Downpipe flange bolt to bolt diameter, can anyone help?

    Hi guys,

    I am trying to get a custom down pipe made, but need bolt to bolt diameter for the flange... can anyone help??

    The exhaust place has 3" one, but wants to confirm before I come down to get it done...

    Would really appreciate it... thanks.
    06 Polo GTI - REVO Stage 2 = 140kw @ wheels.
    06 Golf GTI - Bluefin Stage 1 blacked out with ED30 theme, leather, xenon, etc.
    Tags: None
  • #2
    anyone...??
    need help urgently.... Jmac? or Guy?

    I just can't quite justify paying for a new cat, and just want a new down pipe...

    if i could buy downpipe alone from APR, i would!
    06 Polo GTI - REVO Stage 2 = 140kw @ wheels.
    06 Golf GTI - Bluefin Stage 1 blacked out with ED30 theme, leather, xenon, etc.

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    • #3
      A good exhaust shop with proper cutting and welding gear should be able to retain both your existing flange and cat -- neither are major restrictions (although plenty of people argue the cat is, just not me )

      If your guy can't do this, try another shop.
      2015 White German SUV
      2013 White German hatch
      2011 Silver French hot hatch
      2008 TR Golf GT TDI DSG

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      • #4
        Thank you Timbo, I believe this means that, the flange on both ends are NOT part of 'restriction', but the pipe itself that causes restriction.

        So flange at turbo end is approx 3" wide?

        Thanks for your help, it makes a lot of sense. Retaining original flange also will guarantee an exact fit without leaks.
        Last edited by insanekiwi; 19-05-2009, 07:29 PM.
        06 Polo GTI - REVO Stage 2 = 140kw @ wheels.
        06 Golf GTI - Bluefin Stage 1 blacked out with ED30 theme, leather, xenon, etc.

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        • #5
          Yes, it's actually the bend before the cat that is the most restrictive part of the stock system, according to the guy that did my DP
          2015 White German SUV
          2013 White German hatch
          2011 Silver French hot hatch
          2008 TR Golf GT TDI DSG

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          • #6
            "A good exhaust shop with proper cutting and welding gear should be able to retain both your existing flange and cat "

            Mine exhaust guy did just this, and it looked very good. Id recommend it as well.
            08 Octavia vRS Manual|DNA Stage 2 Tune|Golf R Intercooler|APR DP|Carbino Intake|Uprated DV|Porsche Calipers (NQSBBK)|Superpro Alloy front control arms and bushes|42DD Stealth Catch Can and PCV|42DD Shift Bushes|Whiteline adjustable rear sway|Superpro torque arm bush| Front and rear lower strut braces|Whitline steering rack bush|

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            • #7
              ...funny I was just at a reputable Perth Exhaust shop yesterday morning going thru a similar thing.
              I already have a APR DP and HFC. The exhaust guy says he can open up the end of the existing HFC to 3" and do me a full 3" system from the cat back.
              He also mentioned that metal HFC flow better than ceramic ones which I was not aware of. I think the APR one is ceramic...not sure if it all worth the dollars tho.....

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              • #8
                when i got my old 2.5"dp made they used the existing turbo flange!

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                • #9
                  The turbo housing exit has 90mm
                  The bolt has 10mm
                  Center bolt to center bolt 114mm
                  SILVER TEAM

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