Available in spiral wound. When installing be sure that exhaust stack and cylinder flanges are flat. Torque exhaust nuts to that specified in manual, retorque after hot. For continental or Lycoming. Fits all continentals A65, C85, C90, 200, 300, E185, E225, O470-A, E, J AND IO470J, K. Fits all Lycoming engines except IO-5400-B, E, M, WD, IGO, 540-B, IGSO- 540-B, TIO-540, TIO-541 and TIGO-541.