[blueraider1999]

Anyone have instructions or where I could get for a 7,4 mercruiser

[Motoxxx43]

This question comes up often. I know there are answers on MOC. Try the search feature for "captains call" or " silent choice". Corsa is the manufacturer if you want to try a Google search. As far as buying, sometimes eBay has a used set.

[cswinings]

What model boat do you have? There are lots of options for how the exhaust exits your boat, and it partially depends on how your transom is designed.