so you ran over something that put a hole in your oil pan and you replaced your complete exhaust (headers and muffler). Now your bike won't 'move'?
Did the hole in your pan cause you to lose a large amount of oil? All your oil? Did you continue to ride after you had the hole in the pan? how long did you ride with the hole in your pan? (trying to determine if you damaged something from the impact).
when you pull in your clutch you can move your bike by pushing or walking it around...but when you release the clutch, as in a first gear take off, if does not move? Does the engine rev up ? What happens when you let the clutch out to try to move? Have you followed your clutch cable down to your tranny to see it it is moving when you pull and release your clutch lever?
Is your chain on? Sprockets are ok? Gas in the bike?? Hell...I'm out of questions...