The only thing the PCM uses the downstream 02 sensor for is comparing the air with the upstream sensor to determine if your cat is working properly or not, that's why you get a CEL if you use a racepipe.
What I meant is that the PCM does not know you did something in that area, it just doesn't care about anything that happens after the turbo.
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Patriot Blue 5-Spd, Stage I, Mopar BOV, BTG Intake, Custom 3\" Turbo-Back, Spring Mod, BTG Shock Tower Brace, Vogtland Springs, Koni Shocks, Eibach Sway Bars, Azev Type M 18x8.5 wheels, Ventus K104 tires, Projector Bi-Xenon Lights, Rear spoiler, Autometer Gauges, Illuminated sill plates, K&N Oil Filter, Mopar subwoofer. Mexico City. See pics: http://www.sportcarsforum.com/forum/viewtopic.php?t=715
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