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Old 02-24-2010, 08:28 PM   #2 (permalink)
jpit
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Join Date: Feb 2009
Location: Washington State
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Drives: 370Z Tour MT w/Spt
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Basically it optimizes the air fuel ratio and ignition timing for your particular car. When you add an intake or an exhaust it can change the A/F ratio and a tune from Uprev or Cobb isn't a bad idea. However results from the tune can vary greatly.
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