HKS is a the crowd favorite for the VR30. I like it as well, though may use a Tial setup instead.
BOVs are, in my opinion, necessary for the VR30 as it doesn't come with any kind of BOV or re-circulation system from factory (from what I recall).
BOVs are, in my opinion, necessary for the VR30 as it doesn't come with any kind of BOV or re-circulation system from factory (from what I recall).