im tring to put one on my brothers 240 its a Greddy Type S bov but when he shifts his car blows off correct me if im wrong but arent stock bovs susposed to be recirculatory? cause when he shifts it make a PSH PSH PSH PSH lol like that i guess do we need to cut that off weld a new piece of pipe on and put the greddy type s on or what?