Its hard to believe. 2005 is the 25th anniversary year of what has turned out to be Volkswagen of Americas most popular car, the Jetta, The all-new fifth-generation 2005 Jetta is the largest and most well-appointed Jetta yet, yet it has gained in performance and its fun factor.The styling is all-new, too, with more than a hint of influence from Volkswagens Phaeton premium luxury sedan.Under that new hood is another surprise: no more four-cylinder gasoline engine. The old 115-horsepower 2.0-liter inline four has been replaced by a 2.5-liter inline five. With 150 hp.Meet the new face of Volkswagen. Not only is the new Jetta larger than the previous generation,it introduces new styling that is both evolutionary and revolutionary. Volkswagens new Jetta has gotten a little larger, and more luxurious, but it hasnt lost its verve.