i have a 94 yamaha waverunner 3. it was givin to me from a friend that couldnt figure out what was wrong with it. he said that when it was in the water it would take off then bog out after about 30 seconds. i got it and hooked it up to my hose and found out that there was water coming out of the water lock. is this also the muffler? there is a crack down the side.would this cause it to bog and not run right besides the leak? can i get rid of this box or find a cheaper alternative? i appreciate any advise. thanks tim