Well, just installed my CAI along with returning my HKS BOV to recirc. from VTA...Question is, the sound is awesome, now you can clearly hear the turbo whistle, but now I'm hearing BOV flutter also...under low loads its sounds just like VTA but more softer, but at high RPMs its starts to flutter...just wondering if the BOV is working the way it should and that the CAI is just amplifing everything...or maybe the BOV is not opening...in VTA it worked just fine, but i decided to change back to recirc. because the backfiring and jerking shifts were getting annoying...thanks for any input...