I have an exhaust system (muffler and headers) for a Lycoming 0-320 from a Cessna 172M sitting in my garage after a switch to a Powerflow muffler. Want to sell it, but have no idea what its worth. Its in great, used condition. Hoping to cover the cost of new interior bits so my interior doesn't look as shabby. Other than CL, and ideas on where to list it for sale?