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Old 01-03-2012, 05:21 PM   #3
Parag

 
Drives: 2010 camaro 2SS LS3
Join Date: Aug 2011
Location: Denver
Posts: 1,334
they are o2 simulators. they just hold a constant ohm level to trick computer. they are hard to find because of above

http://www.epa.gov/compliance/resour...aa/casper.html
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