Greddy BOV w/ NO Stalling

i also still have my stock bypass on there, and im not reciculating anything just have cold air injen intake and harpipes with rs and no problems
 
hybrid bov will it raise boost?

if i get a turbo xs hybrid bov will it raise my boost at all for my 08 MS3 or is it just a waste of money . also dont want to through a cel? this valve is vta and recirc. so ill get some sound and i thaught a little performance boost at the same time any suggestions?
 

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