current engine has a REALLY bad knock. had ESP have a look at it and they said definitely a rebuild and to budget for between 12-15k. current engine was rebuilt about 25000k ago in melbourne, so forged internals, r33 crank, n1 oil and water pumps, and also n1 block, reconditioned head. unfortunately not being incredibly mechanically minded, at least when it comes to the internals of an engine, i'm relying on what places like ESP are telling me