This valve injects very small amounts of agitated air into the inlet manifold at certain specific pressure. This causes turbulence in the induction gasses which creates a better suspension of fuel molecules and thus better combustion, producing a more efficient and cleaner burn.

Universal

China Boost Valve- DTune Racing Performance Parts

[Boost Valve]
Boost Valve replaces your standard fuel pressure regulator and its purpose is to increase the fuel pressure when you put your foot down, which causes extra fuel to be injected and better acceleration.