I still do not believe that the BOV opening for a split second when you get off the gas hurts performance. I have a tial BOV on mine and when the car is idling the BOV is closed. It opens when I let off the gas after a spirited stomp on the gas pedal and then closes. It does not open as the car is shifting, you would hear it if it did. So I still would need proof that VTA hurts performance. The tubes were put on for emissions IMHO.