A single downpipe gasket goes in-between the turbo and the down pipe as downpipe is the main pipe after the turbo. Most common are metal based and can be used a number of times. They are of different specifications according to the diameter of down pipe. Good products are made of high-quality stainless steel and are often customized. Products made of fiber and high quality silicone are also available in the market. They come in the price range of $20 to $35. China is one of the leading manufacturers. Australia, South Africa, South America and Western Europe are the main importers.