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HANDOUT - An undated handout picture made available by German car manufacturer Volkswagen (VW) shows an employee refitting 1.6-litre diesel engine of the EA 189 type with a flow straightener which improves air suction and resulting in more efficient burning of fuel, and ultimately help to improve the exhaust output in accordance with emissions standards. Photo: VOLKSWAGEN/dpa (ATTENTION EDITORS: FOR EDITORIAL USE ONLY IN CONNECTION WITH CURRENT REPORTING/ MANDATORY CREDIT: Photo: Volkswagen/dpa) - NO WIRE SERVICE - (KEYSTONE/DPA/Volkswagen)