I have just recently purchased a 1990 Celica gt4 st 185 It is basically stock I have noticed that the turbo is Not boosting like it should an upon pulling it apart there is play in fins plus oil residue which means need new turbo (already fixed oil leaks on engine as it still had crappy standard gaskets) As it is only a ct26 what bigger turbos would suit that pretty much bolt on to the existing pipes and also how hard is it to install a front mount intercooler