Well from what i have tried, the only thing that could be changed is the setup and how hard or soft the shocks are, as-well as springs. Well the last competitive race i did with one, was the in-door finals and the shocks were quite hard so over the bumps the back-end might suddenly pop-up, which sometimes makes it hard to race on bumpy tracks. But on the rest of the track it was awsome, a really good stable car to drive, very fast and smooth.
