ArizonaMx-5

So I was turning right just on a regular right turn onto the highway and just started picking up sped gradually and next thing I know I hear a clunky noise coming from the rear . The car still goes into gears but has a loud clunky noise like somethings banging still runs but only like at 5mph with loud banging noises. I haven't had time to look at it I wanted to hear some opinions first just in case I decide to go to a 1.8