The S4R Testastretta is the latest update on Ducati's highly successful Monster line of naked sportsters. It's been 14 years since the first Monster captivated us with its oddly compelling visage, and it began its long life powered by the air-cooled 903cc V-Twin from the 900SS. Its elemental nature and versatile platform appealed to riders around the world, spawning a class that would later be termed Streetfighters. For 2007, the S4R Testastretta gets the burly motor from the S4RS but does without the Ohlins suspension and a $2000 higher price tag. Otherwise it's the same bike except for different wheels.