i had two LB7 turbo go bad on me. one was original turbo with 100k miles on it, bearing went bad and chewed up compressor wheel bad. second one same as you broke waste gate flap off. So I got used turbo took the hot side off and had it modded back to old hot side specs port and polish. sucks i know thats not cheap fix. Y i decided i had enough problems with LB7 injectors then LB7 turbo problems and swap everything to LLY.