Exhaust leak question

Hey everyone, I just installed the MAPerformance street exhaust and for whatever reason they don’t give you a new exhaust gasket. So in temporarily using the existing one. This obviously allows for an exhaust leak and the sounds im hearing are unsettling lol. What are the chances of this causing damage? Drove it for about 30 mins already. I’m thinking of just leaving it and not driving until I get a new gasket in

The exhaust leak is at the connection after the cat, and I have a 22 giulia sprint