There is no physical reason out side of the turbo itself for it to surge, everything has been removed and checked over 10 times, no leaks, no restrictions, no loose connections just a complete inability for the turbo to do what I was told by stao it would do. If I knew how much trouble this turbo was going to cause i could have just purchased a garret or hks kit and saved alot of money and stuffing around. Am I wrong that I believe a product should do as the supplier says it will. Regardless if the surge, my turbo heat soaks at 16psi, how anyone can say they are running 18-20 psi without killing their motor has got me stumped.