Pretty sure it's 2 Garrett GTX28r turbos. Setup should make around 800hp with supporting mods and tuned correctly. Obviously meth will be needed for max performance until someone releases the appropriate fuel system upgrades like FPR, HPFP, etc. the LPFP upgrades are a good start though.
2011 335is DCT, JB4 MHD BEF, stage 2 LPFP, e50 50/50 meth, FBO, MT ET Streets when needed