The Mack Replacement Pipe is a practical and reliable solution for replacing the 4ME-21650 turbo pipe. With a 4" diameter and made from aluminized material, this pipe is designed to fit perfectly and provide optimal performance. Its durable construction ensures long-lasting use, while its compatibility with the OEM part number guarantees a seamless replacement. Trust the Mack Replacement Pipe to deliver the benefits of improved turbo functionality and enhanced engine performance.