I also have a turbosmart dual port BOV. I run it full rec mode since everybody says so and I do notice the car runs better in full rec mode than then it did in 50/50. I add an AMS sri which changed the BOV location to be in a more direct path above the LICP. This caused my BOV to flutter. The spring is too weak to handle the additional flow. TurboSmart offers different springs for their BOVs'. After doing some research I purchased the red spring and it solved my fluttering problem. Hope this helps.