Superstar Racing Experience Is IROC With a Grassroots Twist SRX isn't competition to NASCAR, but it could fuel its next TV contract. Superstar Racing Experience Tony Stewart anticipates a dogfight from Bobby Labonte when they eventually find themselves side-by-side in the Superstar Racing Experience this summer, friendship be damned. That’s kind of the point. "Remember one thing," Stewart says, "We're still racing and we're still going for wins and trophies. So, at the end of the day, it doesn’t matter how many friends you have when you take the green flag." Stewart has made a lot of friends over his three decades in professional motorsports and he’s taking a handful of them back to their roots over the next two months for one of the most anticipated experiments in recent motorsports history.