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I bought about the same ones from Auto Zone. Because when I deleted my header cats and install straight headers I moved the O2 sensors to the before and after the mid pipe cats. It has been 2 years I have not had any code either before or after having the ECU flashed. My fuel economy still 20 city to 30 highway. Don't ask about track fuel economy.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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