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The powertrain harness should be all you need. It only joins the interior harness at one connector right near the PCM if i remember right. I know for a fact that the PCM wiring has it's own grommet through the firewall.
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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