2009 335XI going to FBO and upgraded turbo, any suggestions?
As title, I going to FBO and upgrade the turbo within this few months. May or may not add meth kit, still debating.
My corcern is, how reliable the AWD handle the increased HP and torque? If something wrong with the transfer case, how much it takes to fix, part plus labor?
Beside the transfer case problem, what else I may face with this setup?