I recently went ACIII and am only running 3 psi. This is not the problem because I am waiting to get the J&S before I boost higher. Last night I drove my car around town for a bit then when I got on the high way it sounded like I was driving a lawnmower. I checked the FS header to make sure it wasn't cracked and it looked fine. I have alot of engine noise that sounds like I am getting air or pushing air out from somewhere I shouldn't. I am pretty worried and the sound is not detonation. Any help would be great since my focus is running like [censored].