Fiberglass wet exhaust muffler is typically found in V-drive boats or boats with limited space. Centek 3 in. Minimax Inline Muffler | 1050300 3 in. Minimax Muffler 3 in. inlet and outlet length 6.38 in. diameter 13.75 length Ideal for V-drive applications and boats with limited space For above the waterline use only