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haha. so swed and I spent like 6 hours tuning the truck tonight, and all I can say is holy fucking shit. I never thought that a crew cab could haul ass like that. It was fucking amazing. Fuel economy is shot...but fuckit ive got power. For any of you that do tune however we ran into 2 issues we currently cant explain. The first is that the truck is not following commanded AFR. We are seeing it drop as low as 10.1 under high RPMS and 2nd to 3rd shift. The other one is we tried to run the monitoring software with the closed loop disabled to gather info, but when we turn the feature off, the software returns" OPEN LOOP NOT READY" error and just stays like that. Thanks guys!! oh yeah its an 04 I-5 Z71 CC :355group: