The Tire Rack Ultimate Track Car Challenge Presented by Grassroots Motorsports is now just two weeks away, October 24-25. However, you can still sign up and join the field that includes this 2013 Radical SR8 of Heikki Rinta-Koski.
Heikki calls his Radical a “very grassroots effort made with production parts.” He adds, the power plant consists of “two Suzuki Hayabusa …
