Mines is split off and flutters...I can barely hear it.

 

the BoV should have it's own dedicated vacuum source like Ted said and the vacuum source should be as close to the port openings as possible(as low on the manifold as possible like the stock BOV vacuum source).

as far as i'm concerned i believe that a faster opening/closing BOV like the SSQV would work better on the hot side of the pipes near the turbo, a slower reacting BOV like the S type would work better on the cold side of the pipes.

 

I've got the single vacuum source for my BOV and it is about 8" from the turbo on the hotside.



Boost Boost Gobble.

James