Episode 4 – Chevrolet Corvette ZR1 vs C6.R Road & Track Presents – Its a battle of American muscle when the Chevy Corvette ZR1 battles it out on the track against the explosively quick C6.R in part 4 of The Ultimate GT Showdown. Hosted by IndyCar driver and commentator Sam Posey, and includes on-track driving by Jan Magnussen. Read the full road test data here: bit.ly Connect to Road & Track Twitter: www.twitter.com Facebook: www.facebook.com Each week, the Car and Driver YouTube Channel will launch episodes of The Full Hoon, Driver Rehab, Battle of the Beaters, Car and Driver: Tested, Popular Mechanics Saturday Mechanic, and Road & Track Presents.