A wastegate on the compressor side of a supercharger system is what I am referring to. Its a bad idea. The more pressure the blower creates the hotter the air charge, and in many cases to further out of the efficiency range of the compressor you get. Spinning the compressor faster requires a great deal more power to be used from the crankshaft. Now think about what is going on. Say you have a system running at 8psi, you add a 8psi wastegate to the compressor side, and a pulley for 16psi. Yeah, you'll get into boost very fast (the compressor is spinning faster) but after the wastegate opens and you begin to vent pressure (it would take a BIG wastegate mind you) you're now running a hotter air charge (less timing) and spinning the compressor faster so its using MORE power from the engine. But your still seeing that same 8psi. In this case you would make SIGNIFIGANTLY less power than if the car was simply pullied for 8psi, the ONLY benefit being the increase in pressure at lower RPM's.