I have an "NEW OUT OF BOX" unused set of Drew Marine Shotgun exhaust silencers. These retail for $500. These are the older style with the spring actuators. As you can see have never been used. These are designed to slip over a 4" thru hull exhaust tip. As the rpm and exhaust pressure increase the silencers open to be completely unrestricted. At idle they are closed and help quite everything down substantially. Everything is included. Bolt on and go. If you're not familiar with these you can find more information here: http://www.drewmarine.com/products/shotgun/shotgun.html

Need two sets. Know of any others for sale. The older style? If so I'd take these
John.

I have not seen any, but these could easily be changed to the new style. Drew Marine will sell the actuators. There are also some on ebay

Sold