Ive had my S/C for over 2 years now not one issue. Currently Im running on 7psi with the Emanage untuned with just the map clamp with colder plugs. Since its winter, I havent driven the car much.
Last month I noticed like a bell ringing sound in boost so I backed off. Its been cold so I havent driven her since now. Today I tried again and same thing. I can only think that its the engine knocking.
I have just a basic a/f gauge for now. The Uego is sitting in the tunk waiting for a warm day. Ive had the car dynoed and tuned enough to know about where my a/f on my gauge should about be to be safe. Ive noticed that its not even going into full richness at full throttle.
My conclusion is that the cars running very lean all of a sudden. Anyone have any ideas on what I can check for the issue?

The only changes since when the car ran fine until now was a test pipe and a new battery. I dont think the Emanage would have lost its throttle position settings or anything with loss of power.

I need some ideas.