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Old 10-19-2011, 06:24 PM   #50 (permalink)
DarkZide
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Join Date: May 2010
Location: TN
Posts: 291
Drives: 2010 370z BC M6
Rep Power: 15
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Had to replace a bad upstream O2 sensor on my old grand am. Broke the bolt heads holding on the heat shield so i had to drill them out. Apparently the exhaust manifold was really weak/thin or I had the worlds greatest drill bit because i went straight through the manifold and through a coolant line.
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