Hardin Electric Mufflers
 

4.5" text 440-679-9094 for pics. Bought on here... Never ended up using them. 1 set available (2 tips) good shape. These are thru hull with flange welded to them. Open pipes... Flip switch, closes flapper and redirects thru muffler. Needs the outside flange... Teague sells these for $950 they also sell the outside flange cheap.
$225 shipped