You sure it's exhaust not a leaking valve cover? Also, although it could be an issue with manifold leaking, I wonder if maybe it's another joint in the exhaust system.
You just had service II done. Did they do anything around the exhaust? O2 sensors maybe...maybe your front exhaust bracket is loose and put pressure on a fitting?
I'm so depressed. No one wants to come see me in NYC: Sat, Oct. 8, 6 p.m. at Greenwich Village Comedy Club.
Mangofy your E46!