check codes, without them its a shot in the dark. If your charge pipe blew off or cracked youll get boost leak codes, so see what comes up. "limp mode" can be totally harmless if its simply a matter of the engine being too hot, but there are many things that can cause it. I tend to doubt your cp blew off at relatively modest boost, but its absolutely possible.
E88 FBO N54 Alpinweiss/Coral Red/Meisterschaft Race/Berk Resonated/Macht Schnell 3"/ER CP/Synapse/VRSF FMIC/FFTEC LPFP/BMS DCI/BMS Thermostat Delete/Rob Beck PCV Valve + Cap/BMS OCC/Cobb E30/ST Coilovers/Apex ARC-8/Project Kics/Macht Schnell Stud Conversion/Rogue Transmission Mounts/Alpina TCU Flash/Icarbon/3D Design/BMW Performance/Cyba