LOL... the profec B has been proven over and over in tests (aka sport compact car & turbo magazine) , respected by dyno tuners (ask John at SS and Enthalpy), and proven on many people's cars (I know many people on TR have the profec B and B stage II).

It dosent spike like a ball and spring does, the "locking screw" dosent get loose and all of a sudden your running higher boost, you dont have to open the hood to adjust it, its not THAT expensive (used profec B's can be had under $200), and its easy to tune quickly for changing conditions (gas, weather, or others).

Putting a manual boost controller on a 1998 supra TT.. Is like leaving your 2 year old daughter with a bad day care...