Mercury - Active Trim Mechanical Kit MerCruiser Dual Engine 8M0111554. Overview. The Mercury Active Trim Mechanical MerCruiser Dual Engine Kit (8M0111554) is designed for dual-engine mechanical-control MerCruiser sterndrives - specifically the 4.5L and 6.2L 300 & 350 HP models. This system automatically adjusts your engine trim for smoother acceleration, consistent handling, and better overall fuel economy.. With Active Trim, you can leave the trim buttons alone - it continuously adjusts trim ba