I have 2 sets (4 total) of mufflers for sale right now on ebay.

These are callifornia legal and have a great low rumble. They are stainless steel an in excellent condition. Other than light use they look perfect. I just finished polishing them up and they are shining like a mirror (my wife helped> have to give her credit). They come with the rubber flapper (shown in pics). These ae removable or can be left on. Also, they have internal flappers. These particular flappers are made of stainless steel and seal very well. Most tips and mufflers sold have a rubber internal flapper. These are much higher quality. The slightly rusty spots in the pics are only superficial where the shaft for the internal flapper was welded.

Dimensions: The tube that goes through the transom is 4" diameter and 3.75" long. The part that will stick out of the back of the transom is 10.5" long and 6 inch diameter. Overall length is 14.25". They have 3 studs that are 5/16" diameter and 2.625" long.

http://cgi.ebay.com/ebaymotors/Marin...ssoriesQ5fGear

http://cgi.ebay.com/ebaymotors/Marin...ssoriesQ5fGear