This is a video of the IMSA supercar series, a ZR-1 is running against Callaway and several Consulier GTPs. The Consulier is a much lighter car, and you will hear how they weighed the ZR-1 down with 500lbs to try to even the field... this lead to some dangerous braking issues and eventually teams pulling out of the series. Credit again to Brian White for sharing.
https://youtu.be/TNbFjn_-UCo