Exhaust flanges are metal components used to connect and seal sections of an exhaust system. They are typically made from stainless steel or mild steel and feature a flat, circular design with bolt holes that allow them to securely fasten exhaust pipes or headers together. Exhaust flanges ensure a tight seal to prevent leaks, maintain optimal performance, and withstand high temperatures and exhaust gases. They are commonly used in custom exhaust builds, repair work, and for connecting components like catalytic converters, mufflers, and headers.