Chevrolet 5.7lt inboard engine which powers the Ultima X skiboat Functional, well appointed interior. Ergonomic cockpit of Ultima X Skiboat. Ultima X ski boat has ample room & comfort for both driver & passengers. The inboard 5.7lt Chevy engine produces sizzling performance. Aerospace inspired, high tech hull of the Ultima X ski boat. “Ultima X” has the room & comfort of much larger boats & the agility of a small boat The timeless lines, sumptuous upholstery & generous storage of the “Ultima X” Ski Boat. “Ultima X” – a truly functional water sports workhorse with sizzling performance The Prestige Ultima is a ski boat with pleasing lines & aesthetics