Mercury - Active Trim Kit 75-115 HP FourStroke Single Engine 8M0111546. Overview. The Mercury Active Trim Kit (8M0111546) is designed for single-engine 75-115 HP Mercury FourStroke outboards (serial number 2B095049 and newer). It automatically adjusts engine trim based on speed and RPM to deliver smoother acceleration, faster planing, and better fuel efficiency - no manual trimming needed.. Active Trim constantly monitors how your boat is running and fine-tunes the trim angle for the best perfor