I recently made the move to Phase 1/2 w/ PB running the V2 intake. I've noticed in the upper RPM that the intake has a distinctive whistling sound to it. I'm assuming from the higher CFM being moved through the intake track and the air is getting split somewhere causing the sound. Now I don't care about the sound, but my girlfriend has taken issue with it. I've triple-checked my install (I'm a mechanic by trade so no dummy here) and it seems sound and by-the-book. I'm hoping to get some responses from other V2 owners to see if this is the norm or not. If it is, I'll have to see about getting the V4 maybe or just leave the girlfriend at home lol...