 Complete the following phrase:  The Unification Era spans specifically from either 2003 or 2008 through 2011. By the time of the formal 2008 unification, it was contested with the aforementioned spec car, the a hrefDallara23Third20generation2028IR-032020IR-0529Dallara IR0305a powered by the normally aspirated Honda V-8 engines. With the sudden influx of former Champ Car teams and drivers, and an abundance of available rolling chassis, fields briefly grew. For a few years, bumping returned to time trials, and the era was highlighted by the 