I bought a Nissan gtr vspec8 for this.
I added all of the weight reduction options, the sport air filter, a customizable suspension (lowest setting, stiffer suspension, more camber), sport soft tyres, clutch and at last a flywheel.
After that the car gets more competitive.
In the first run I came second the leader won with half of the main straight in front of me. But after knowing the car and the track better I overtook the leader in the very last corner. Great fun - without having a bad felling about overpowering the car.
The rx7 challenge was good, too. That's a neat oversteering car that likes to be drifted with. After I realized to rev it up to 7800rpm (the thing starts going at about 6800rpm) a victory was not to far.