I am looking at putting in a Thru hull exhaust on my 1988 Four Winns Sundowner. Does anyone know a good site to purchase a nice exhaust for a reasonable price and roughly how long it takes to install a exhaust like this? I am not sure if I am going to install a above the water exhaust or a dual exhaust which I can switch over when going into docks and etc. It's got a 305 Chevy motor and a OMC outdrive on it. Any advice/links anyone can provide would be great. thanks