Diamond Eye 3.5inID-4inOD ADP6-A

This Diamond Eye Performance exhaust adapter, part number 400042, is what you get in the box. It's designed to connect exhaust components with different pipe sizes. Specifically, this adapter has an inner diameter of 3.5 inches and an outer diameter of 4 inches, allowing you to bridge the gap between these two common exhaust pipe dimensions.

This adapter is useful when you need to mate a 3.5-inch exhaust pipe to a 4-inch exhaust component, such as a muffler or tailpipe. It's a straightforward piece made to help you achieve a proper connection in your exhaust system build or repair. The adapter is constructed to handle the demands of an exhaust system, ensuring a secure fit.