so the turbo seal could've been toast. well my turbo had the turbine on the exhaust flange side busted off, which ground down my oxygen sensor. the other turbine had rubbed the housing. it doesn't look very nice. i replaced with a 16g. now i am wondering if the turbo went, could it have been caused by a cracked exhaust manifold? should i be able to just slap on the new turbo and be done with it? and also, does any one know what grade etc the bolts for the manifold to turbo bolts are, as well as the turbo to exhaust flange?