Better check your cats first. I had same smelly situation, thought there was an exhaust leak. My muffin man put the car up, and tapped my cats and you could hear all the filaments had disintegrated. When he took them out they were practically hollow. I did have rattling cats for about a week beforehand. Had him cut in DOT grade cats, and saved a bunch of money...there really is no difference...cleaning exhaust wise or performance.
Ended up not doing the .02's at all...yet.
Made some Touring clears instead