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The codes are turbo related, I'd check for any leaks...wastegates could be leaking and they don't have to rattle to cause reduced performance from the tune...
Maybe some high-end BMW specialist shop can analyze it for you...wrex90 post#6 looks like a good place to start. Have you tried euperformance.com?
they are in St Louis...
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Metallic Black on Black 2009 135i, new waterpump, OFHGs, and VC gasket...RB turbo PCV valve (ooo), NGK performance plugs...V3Cobb access port stage 2+FMIC, Injen intake, Mishimoto clone FMIC, ARM charge pipe, ARM downpipes, Whiteline subframe bushings
 
Last edited by Mr Gasser; 11-01-2018 at 12:10 PM..
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