Establishing a niche for itself after three years sold in the United States, the Toyota Prius is completely re-engineered to be more efficient in managing fuel economy. The near triangular-shaped profile of the 2004 Prius feature ultra-slippery aerodynamics. The Sienna minivan features an all-new design for 2004 accompanied with a sleek exterior look and a rich assortment of standard equipment. All-wheel drive is optional on the new Sienna for improved road handling. Almost six inches longer than its predecessor, the 2004 Toyota Sienna boasts considerable greater interior space. A new generation Camry Solara appears based on the latest Camry platform. A new 3.3-liter V-6 replaces an existing 3.0-liter powerplant offered on the Camry, Camry Solara and Highlander model. The Toyota Highlander as well as the 4Runner add optional third-row seating. Vehicle Stability Control now comes standard on all Toyota RAV4s.