Sylvan’s S5 Extreme may scream party above, but it’s all performance below. That’s where you’ll find the company’s unique Revolutionary Planing Technology (RPT). It includes large, 27-inch tubes that eschew conventional roundness but rather resemble mini V-hulls, with welded keel and chines. In theory, an RPT should displace less water and thus produce more speed, even with less horsepower. Our test boat, outfitted with an additional center RPT tube and powered by a Yamaha F300 outboard, planed immediately, reached 30 mph in 6.4 seconds and peaked at 44.7 mph. It also displayed the type of snappy handling that will bring a smile to the face of almost any performance-minded captain.