This is for a very nice #15 BCM  40mm or 1 9/16" muffler for unknown large gas R/C model airplane engine. Might fit other engines with 1 9/16" center to center screw holes.  $6.50 shipping U.S. $20.00 shipping Canada. $25.00 International shipping for all other countries. I combine auctions to save you money on shipping. I am listing a bunch of engines, parts engines, project engines, new and used model airplane and boat parts. Shipping rates keep going up and I can't stop them but I will still try hard to combine shipping and give you the best shipping rates I can and refund you over payment on shipping rates if you buy more then 1 item.