10 x 4 Oval, 18" Length, 1.75" Bore, Wing 200497

10 x 4 Oval, 18" Length, 1.75" Bore, Wing. A wing configuration refers to a silencer that flows in via an offset, through the length of the silencer, through a mandrel bend at the far end acting as a U-Turn and then out the same end on the other offset, parallel to the inlet.