This NITRO Z18 bass boat is a champion from bow to stern. America's best-selling fiberglass bass boat and the official boat of Major League Fishing! The Z18 is a high-performance fishing boat for everyone. Compact, nimble and powerful, it's got everything you need to fish at the top of your game. POWER This Nitro Z18 has been upgraded to the largest factory rigged Mercury 175 Optimax Pro XS for speeds up to 68 mph! The Mercury 175 Optimax Pro is the best-selling tournament-fishing outboard in the world and has powered more competitive anglers to victory than any other engine.