You have to remove the bolts from the exhaust, and 4 bolts from each jug, then pull. But, make sure you disconnect the vent line. Each jug will have a line attached to it which is connected to a T. The lines are very short and a pain to get at.
But first thing, go buy those hex tools Lou mentioned in the other post. 10 min to get the bolts out then with much less swearing. Gl.
And make sure to just look over the service manual for your ski. I'm going off of mine 787.