Complete Idiot said:
Melted rear is bizarre
My first thought as well, but this provides some context:
As to why the tail end wound up so roasted and toasted, well, it turns out there is no real exhaust system per se on the car; it has Kooks headers and AWE straight pipes, but no muffler. The system is not only loud (Hughes said her ears are still ringing), but also generates quite a bit of heat. Anhalt is working on figuring out the exact cause of the melted bumper so he can remedy it in time for the next BBORR event in April 2026.
https://www.roadandtrack.com/news/a69109945/c7-chevrolet-corvette-zr1-averages-173-mph-for-118-miles-melts-rear-bumper/