Mercury - Active Trim Kit 75-115 HP FourStroke Dual Engine 8M0111553. Overview. The Mercury Active Trim Kit (8M0111553) is built for dual-engine installations using 75-115 HP Mercury FourStroke outboards (serial number 2B095049 and newer). It automatically adjusts both engines' trim angles based on RPM and speed, giving you smoother acceleration, faster planing, and better overall efficiency - without ever touching the trim buttons.. Active Trim constantly fine-tunes your running angle for ideal