The power that an engine outputs doesn't necessarily affect reliability. Just as manufacturers use common platforms for cars e.g Just as VW use a Good-Better-Best approach across three of their brands "Skoda -Volkswagen-Audi"; they use one chassis, engine and running gear on competing models across the three brands to minimise costs. Manufacturers will usually offer one engine in at least two and often three levels of Power and Torque output with the difference being the tune in the ECU. The same "multi power levels from one powerplant" strategy is employed by most Truck, Tractor, Outboard Engine and Jet Ski manufacturers. The key drivers of engine reliability are how the vehicle is driven and whether the owner adheres to the manufacturers maintenance schedule. Eurotune always tunes to safe levels to ensure long term reliability whilst enhancing drivability and enjoyment.