HI ACF--Many thanks for the web site--needless to say THIS website is a wealth of information thanks to you guys-I have been in contact with a couple of dealers, they don`t seem to either be knowledgeable or are indifferent about information--ie-- just pop out the 4 screws holding down the hatch over the muffler and determine where the leak is --Well, I have abuddy who has an 87 and states that there is no muffler ,just a straight pipe and super trapps which had been removed!Supracomp stated in JULY 05 --there is no muffler between the supertrapps and the manifold on 87`s-- so there you go !Any How my boat is an 87 with the supertrapps removed by the previous owner. Am presently in Montreal,back home n ext week,in time to get serious about boat leaks --will keep you posted ! Regards John D.