Diamond Eye ADAPTER 4in ID (4in TB FITS INSIDE) TO 5in ID (FITS OVER A 5in TB) AL

This is a Diamond Eye Performance exhaust adapter, part number 400054. It's designed to connect a 4-inch inner diameter exhaust component to a 5-inch outer diameter exhaust component. The 4-inch end fits inside the existing pipe, while the 5-inch end fits over the next pipe in your exhaust system.

This adapter is useful when you need to transition between different sizes in your exhaust setup, such as when installing a new muffler or tip that doesn't match the existing pipe diameter. It's made from aluminum, which is lightweight and resistant to corrosion, making it a solid choice for exhaust applications.