Focus Fanatics - View Single Post - Cat delete pipe for 2002 ford focus
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Old 01-14-2013, 11:10 PM   #26
ah1f39
Alone in the Cave
 
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Join Date: Oct 2009
Fan#: 70006
Location: In the Cave, MI
What I Drive: 2000 Explorer 4x4

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The second o2 is for emisions not performance. It measures the ammount of unburned hydrocarbons after the cat
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