The 4″ Adapter (UA9004) is a high-quality product made from T409 stainless steel. Its key features include a 4″ diameter, durable construction, and compatibility with various exhaust systems. This adapter offers numerous benefits, such as improved exhaust flow and increased horsepower. Its unique selling points include its corrosion resistance and ability to withstand high temperatures. Overall, the 4″ Adapter (UA9004) is a reliable and efficient choice for enhancing your vehicle’s performance.