Thanks for the info. I'm going to go with the marine grade stuff but the cost is always higher for that stuff. Did you do any modifications to your system or speaker size?
do you have an FAE on your boat? don't you ahve an 08 xstar with L18? do you have the dual silencemaster muffler option or do you have straight pipes with the baffled tips?
i have an 08 xstar with L18 with straight pipes and baffled tips. it is horribly loud. i am considering retro-fitting the boat to the dual silentmaster option OR adding and FAE to the boat as it is.