The Booster likes vaccum. The engine does a better job of creating vaccum behind a closed throttle body/carby. If you put it on the low pressure side of the turbo, you'll get bugger all vaccum (almost all of the time). It connects between the valves and the carby/throttle body butterflies. As I said.

And you need the one way valve. All booster fitted cars have this valve I talk about. Anything else, and I sure wouldn't insure your car..

Chris