They Will be loud, prob more than you'd like. A dry exhaust will always be louder than a wet exhaust, because the water sort of muffles the sharp bite of the noise. If you are lookin for a good inexpensive muffler, look into the Drew Marine shotgun exhaust silencers. They will stay closed at idle to keep the noise down around the docks but when you give it throttle, they will automatically open from the backpressure of the exhaust. You prob have a 4" tailpipe, but measure the diameter to be sure. They're about $450 a pr. and the ph # is 509-535-3393. Good luck.