I had a similar experience with a kid in a new Mustang GT on i95 south going to Florida with the family. He came up on my tail in the left hand lane with my 50i ACC locked at 88mph.
I put it in Sport+ and mashed the go pedal. I took off so fast to 120mph from 88mph, the V8TT exhaust barked and it was all over. He was going to try to follow but gave up after 2 seconds. My family SUV loaded up with enough bags for a 2 week trip was more than he wanted to mess with.
I also got in a left lane pack from Orlando to Daytona that really was really moving. A Hellcat, M4 and my 50i. I was right there with them in acceleration. It was a safe environment for quick controlled sudden accelerations of each car to show what they had. The X5 50i stood tall. It’s fast for a performance car, let alone a big SUV.
Now I have a new plate. We will see on this years trip.
