What type of tracks do you have in mind? It has been said on this forum that around 95% of tracks all over the country can be driven over in standard cars. The manafacturer's of these cars have already thrashed the daylights out of their prototypes on all types of tracks.
If you want to take on the remaining 5% then you will need a modified everything. Keep in mind that there have been many roll-overs and a few fatalities on those type of tracks.