Blasstperformace does it for 150 but located in canada so 200 around there or so for them. Contact gbodyparts, jaysgn, limited or a Buick turbo vendor. Unless they are a repected hi performance shop that's has history of turbo rebuilds I wouldn't chance it. Also make sure you only use a hotair seal, I believe it's carbon. Someone correct me if I'm wrong. Before anything do you have a open valve cover breather? Have you changed your PFC valve to a new one? For the breather take it off and clean it, if oil soaked it will cause you to get high crankcase psi build up, not good. For the PFC valve just swap it out to a knew one, located on intake just below the throttle body. If that doesn't help rebuilt turbo time most likely. ( iPhone text hope I make sense)