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Old 06-01-2010 | 12:03 PM
  #472  
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DS Motorsport
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Originally Posted by stefan
..as long as you haven't ried a Sirio .12
I drove against one last saturday and I must say they are fast, but not as fast as one of my RB engines.
Also it is known that the Sirio engines are hard to tune and they are fast but not for a long time.
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