i was just tying to answer matteos question....not looking to argue. Hey matteo, you should give Precision Turbo and Engine, in Hebron IN. a call. They could explain all this better than anybody here. I worked there porting turbochargers a while back, that is where I learned what I know about turbos (lol....at least I thought I knew). It has been years, but when I was there, I saw everything from a twin turbo viper to a vorteched suburban. They know their stuff (anybody who reads MMFF or 5.0 mag. can tell you), and they are good people.