make sure you don't have excessive oil in the pan. that will get shit load of oil in you accordian hose and low ic pipe through the pcv system. it might sound stupid, but check to make sure. for a while i was all paraniod after i got rodknock thinking and extra quart or two of oil would help, well. it didn't. it just made me think my turbo was blown when really it was the excessive oil in the pan. first thing i would do after i bought a supra is drain the oil in a clean pan and inspect it for metal shaving.