From 2001 until 2014, he was a pit reporter for "Fox NASCAR". He also served as a fill-in studio host and lap-by-lap announcer whenever Chris Myers or Mike Joy, respectively, were not available. From 2001-03 he also served as host of "Totally NASCAR" on Fox Sports Net, earning a Sports Emmy nomination for best daily studio show in 2002. As of 2014, Byrnes was the co-host of "NASCAR Race Hub" on Fox Sports 1 and was expected to be the lead announcer for the Camping World Truck Series in 2015.