Fiberglass wet exhaust muffler is typically found in V-drive boats or boats with limited space. 3.5 in. Mini-Max Inline Muffler | Centek Industries 1050350 Centek Minimax muffler Reduces engine noise in boats with limited space between the engine and the transom Fiberglass construction For use with 3 1/2 in. inside diameter marine exhaust hose 3 1/2 in. hose inlet & outlet 14.75 in. length 6.38 in. diameter Ideal for V-drive applications and boats with limited space For above the waterline use only Fair sound rating Replaces Centek 1005002