Zeelander, the upscale Dutch builder, just completed a Z55 for a new customer who said he wanted “the fastest Zeelander ever built.” With twin Volvo IPS1350s delivering 2,000 hp, the new Zeelander 55 tops out at 42 knots; the traditional Z55, with twin IPS950s and 1,450 hp, tops out at 33 knots. To fit the larger engines, Zeelander had to customize the hull, adding more strength to the engine room and more lamination from bow to midship. It also upgraded the engine room insulation and installed double-flex mounts on all pumps and motors. As a result, the boat is quiet,…