I'd bring it to the performance shop that installed and tuned the turbos if you can. The shop needs to tackle each probable cause one by one. I'd def check off any of the basics like making sure all caps, intake lines....etc...are secured. Clear the codes and see if it comes back. Just make sure you have a record of what codes popped up before clearing.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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