Stock Car 2018 | Steam Workshop: Click Here Developed as a junior series to the main Stock Car 2018 category within rFactor 2, the SC2018x runs with slightly less power at 650 hp compared to the 750 horses pushing the original car, but this doesn’t mean that these cars are easy to drive, or offer a diluted experience behind the wheel – far from it, as these new machines are likely to produce just as close and intense racing as one has come to expect from this unique form of American motorsport.