Fast boats in modern naval service

Do modern navies operate large speedboats with four or more 300-horsepower engines?

Some forces do, especially Iran, while Western navies more often use fast RHIBs or helicopters for rapid movement.

Western navies use fast RHIBs such as the Pacific 24, officially capable of about 38 knots, but rarely need the extreme multi-engine arrangement described in the question. Larger clusters of high-powered small craft are more characteristic of Iranian forces, while Western fleets may use helicopters when speed is paramount. The distinction is operational rather than purely technological: navies choose the craft that fits boarding, insertion, harbor, or swarm missions. The Pacific 24 provides a reference point without implying that every fleet needs a four-engine speedboat.