To show off the speed and athleticism of its two new aftermarket Volvos, the Swedish tuner Polestar has brought the racecar driver Thed Björk—winner of the 2013 and 2014 Scandinavian Touring Car Championships—to the Auto Club Speedway in Fontana, Calif., to put the 2015 Volvo S60 Polestar and V60 Polestar through their paces. Björk deftly whips the S60 through the turns and tears down straightaways, demonstrating the impressive capabilities of this special-edition automobile.

After Björk pulls the S60 off t…