1994 850 non-turbo...Loud exaust leak coming from manifold.....loud for 6 months....went oer a real nice pothole and it went away....another pothole....it's back....was told it was a manifold...was told it was a expansion pipe to the header....manifold...$260 in parts and a lot of time on my part, and even more if i break a stud....any way of welding or replacing anything without pulling apart the manifold..(if that is what it is)..Common problem???