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Q:Is this stainless steel or aluminized?
A:Hi Bill, good question! This Dynomax Pipe-Dynomax Df (Part No. 52440) is a stainless stell material.
Q:What's the OD on both ends of this pipe. Is this the extension that attaches to the muffler?
A:Yes, the Dynomax Pipe-Dynomax Df - Part No. 52440 is the extension pipe that attaches to the Muffler and the outer diameter of both the sides are 2.75". For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.