Mercury - Active Trim Kit 3.4L V6 & 4.6L V8 150-300 HP Single Engine FourStroke / OptiMax 8M0111545. Overview. The Mercury Active Trim Kit (8M0111545) is built for single-engine installations of Mercury FourStroke 150 HP and OptiMax 150-250 HP outboards, as well as 3.4 L V6 175-225 HP and 4.6 L V8 200-300 HP models.It automatically adjusts your engine trim for smoother takeoffs, better fuel economy, and consistent handling-no manual trimming needed.. Active Trim constantly monitors engine RPM, s