ok, didnt notice the lean bit lol
are you still running the OEM SR injectors? have you messed with your intercooler piping at all?
with boost leaks, leaning out means you have a leak before the turbo (on the intake tract) or around the MAF, basically its the motor taking in un-metered air. anything after the intake with boost leaks creates a rich condition (air escaping before hitting the intake manifold and mixing with the fuel for combustion)
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