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  • CHEN
    S2Forum Addict
    • Mar 2004
    • 329
    • Country: England

    #1

    Back to Bore sizing

    2 & 1/2" or 3" for a 3b S2 running near 300bhp, going from downpipe back? Been told 3" is too big, anyone have any comments?
  • porkkis
    S2Forum Extremist
    • Aug 2003
    • 1994
    • Country: Finland

    #2
    Original downpipe and 2.5 from there on is well enough.
    -

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    • S2central.net
      Retired OG Mod
      • Jul 2003
      • 16590
      • Country: Northern Ireland

      #3
      3" (76mm) exhausts can have clearance problems on the Coupe - both with the ground and with very tight turn over one of the rear driveshafts.

      2.5" is a safe bet and will have no problems with 300bhp in my opinion, but you can also get 2.75" (70mm) from some custom exhaust places - its a good compromise size if you want to avoid the 76mm stuff.


      Paul
      Paul Nugent
      Webmaster http://S2central.net
      Administrator http://S2forum.com

      1994 S2 Coupe ABY - aka Project Lazarus
      2001 A6 allroad 2.5TDi - family tank
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      • audiman
        S2Forum Freak
        • Jul 2003
        • 4827
        • Country: United Kingdom

        #4
        Thats a good point Paul, 2.5" will be fine for 300bhp, its when you want over 400 that 3" is needed.
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        Tom C - www.rcmr.co.uk
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