This is a lightly-used Volkswagen exhaust pipe / resonator from a 2010 VW Golf TDI with 38,482 miles. It will fit VW/Audi TDI vehicles with the 2.0 CJAA common-rail engine including 2010-2014 Jetta, Beetle, Golf and Audi A3.  It is #18 on the diagram above.

Part number 1K0 131 701EJ which retails for over $700 from the stealership. Why pay that when you can get a great-condition used part like this! Happy bidding < ( ^ _ ^ ) >