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That jump in the AFR is a result of the FMU not responding to the boost immediately.....look how it spikes. And with that 50 trim running the dyno in third gear, your not gonna really see boost until 3500-4000, and the graph shows how the AFR's are dropping.
I have a feeling that your used 12:1 FMU may not be funtioning properly, or may not be a 12:1 disc inside.
Back in the day when I ran that setup, my dyno had me in the 10's and 11's for AFR's, but it would spike up for a second right when you enter boost (not that high). I wish I had afr's to show you guys from back then, but its been a long time.
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-Randy: Boosted since 05/05
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