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Thread: Need I help
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Old 09-25-2009, 02:59 PM   #2
egman2005
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Join Date: Mar 2007
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What I Drive: 2003 SVT Focus

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it just reads the a/f ratio. it isnt needed if you are just getting toms out of the box tune for the svt.

but it can help you get a better tune after some datalogging
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