Abstract: A moveable exhaust trim tab for a motorized boat directs exhaust gas and cooling liquid into the water, changing the size and shape of the wake and reducing engine noise. The device comprises a trim tab base having a lip and a cap attached to the trim tab base to form a cavity between the lip and the cap into which the boat's exhaust is directed. The cavity has various apertures that permit the exhaust to exit the cavity and, in some embodiments, permit water to enter the cavity from below. The device may comprise baffles, outlets, inlets, and directional collars to change the flow of the exhaust. The trim tab is attached to the boat with an actuator that lets the trim tab to be adjusted at an angle relative to the boat.