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This is the Align high performance muffler for 50 size helicopters. It features the highest exhaust volume on the market. The carefully designed expansion chamber, accelerator section and silencer chambers provide for quick mid and high range repsonse. Includes one 41.2x270x70.5mm muffler, one pressure nipple, one exhaust guide, two 3x35mm collar screws, 2 washers and two spacers.