There are 4 of these in the set. These have replaceable/ tunable muffler inserts. The item "Vintage Kiekaufer Mercury Aeromarine Chromed Stainless Steel Race Boat Exhaust" is in sale since Tuesday, May 1, 2018. This item is in the category "eBay Motors\Parts & Accessories\Boat Parts\Inboard Engines & Components\Exhaust Systems". The seller is "spaceavenger" and is located in Titusville, Florida.This item can be shipped to United States, Canada, United Kingdom, Australia, Germany, Japan.