Please help with my Turbo M30!! :)

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  • yert315
    R3VLimited
    • Aug 2008
    • 2734

    #16
    I would stay with a single pipe exhaust. seeing that you are coming from a rather large downpipe (assuming its at least 3"), why would you want to separate the gas into two separate pipes? Scavenging efficiency of the exhaust decreases. It is better, performance-wise, to maintain a single pipe exhaust - at least 3" in diameter.

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    • HandalE30
      Advanced Member
      • May 2008
      • 109

      #17
      Thanks alot, I´ll think about doing it like that! but does affect performance if I make a 3¨ downpipe and all the way till I reach the rear subrame and there i separate into 2 tubes of 2.5¨ each?

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      • yert315
        R3VLimited
        • Aug 2008
        • 2734

        #18
        are you trying to do a dual exit exhaust setup? I suppose it wouldn't hurt

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        • pegase747
          Wrencher
          • Jul 2006
          • 279

          #19
          I guess having a single pipe all the way is the cheapest and most efficient way.

          and a last Y at the exit for the dual exhaust will probably not hurt anything being a divergent Y ( 1 to 2 ) , not a convergent ( 2 to 1 ).

          That is what i would do, to keep a nice twin exit looking like OEM...

          Regards / Pierre
          1988 E30 ALPINA B3 2.7 #224/257 Made in Buchloe

          see more : http://www.r3vlimited.com/board/showthread.php?t=71686&referrerid=12460

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