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Those A/F charts don't look right. Why are you even more lean before 5500 RPM after the tune? You are north of 15:1 before 5500 RPM which is dangerously lean. Did he explain this or are the A/F plots not right? Your also more rich after 5500 RPM after the tune which is different than how my car was tuned. In other words the stock tune air fuel plot looks better than the tuned plot.
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