Mavimare Quality Boat Hydraulic Steering Kits- Four Outboard Engine Kits Available For Up To 300hp. Kits available are up to 80hp / 115hp / 150hp / 30hp and now an inboard engine kit. The hydraulic boat steering kits contain 15 metres of hydraulic hose, hydraulic oil, rams, helms and connectors etc and fitting instructions. Prices from only £499.