My car's a manual. The blow off valve is some cheap chinese copy (yeah i know, serves me right) lol
Will be getting something better like a GFB or TurboSmart etc.
To cut a long story short, the best way to solve the problem is to have a plumb back?
However plumb back does not make the woosh noise?
Its not my idea by the way, my wife wants it to make the noise lol if it is going to cause problems, or premature turbo wear etc ill probably put the stock one back on.