Here is my dilema, I ordered a turbo kit that included a Precision turbo PTE 71 GTQ with dual ball bearings. Problem is it has been "under development". The date was set at end of Feb. now it is no where in sight. My options are limited as the rest of the kit works off the Precision housing. My options: PTE 71 GTS (non-ball bearing), PTE 67 GTS dbb, PTE 67 housing with GT40 internals dbb (extra $200??). My goal is 600whp, I can accomplish that with any of the above listed, but I don't want to run 30psi to accomplish this... Any turbo experts please help me make the right decision. I'm looking for peoples opinion that is backed by facts and experience.