I was wondering if there is a way to remove my muffler..
Second question: Does my chain have to much slack on it , or is it just right ?
Your chain should have between 3/4'' and 1" of slack- in fact yours looks fine. DO NOT remove "a link or two" as it WILL be too short.
As for the exhaust bolts, just a little propane torch right on the area that the bolts go into should have them loose in no time.