My SHO has been kind of a problem child. It's a 2011 non-PP. I've had both turbos replaced twice and a new long block put in about 2000 miles ago. Now I'm having some stuttering issues. Mostly when I lightly accelerate. If I step on the gas there's no stuttering. I am getting an air leaking sound from the part in the photo. It's located right next to the master brake cylinder near the back of the engine. A: what is this part called? B: Is it supposed to have some air loss? I am also getting engine code P0430 From what I can tell by research, it's more than likely an issue with the Catalytic Converter. I'm going back to the shop that put the new motor and turbos in tomorrow. I have very little confidence in him (however the engine is under his warranty) He literally had my car for 5 months. Any insight is helpful. Thank you!