This is on a turbo 2.3 with a 3" DP and no cats. How does your exhaust note change when your wastegate opens? Granted mine is a 2.3, but when I get on it i hear the turbo spool and the engine builds boost fine. I then here a high pitch squeel which I always thought was the WG opening. But today I started to think about it and noticed that the noise happens at diffferent points in the boost curve. I am using a MBC set to 16-17 psi. I still think the noise is the WG, but just thought I was ask others.