What color is it.. it could be burning oil from your valve covers, or it could be something much more serious...
What does it smell like?
Valve covers were just replaced ~500 miles ago.
It's definatly biting oil. Smells like it and smoke is a greyish white.
There you go. You answering your own questions. ALWAYS ChECK YOU LAST REPAIR FIRST! I hear the gaskets on the valve covers on these are a little tricky to get right. I bet you have a nice little leak on it.
But that doesnt really answer the exhaust question