Steve Phelps, chief marketing officer for NASCAR, poses as "Kevin," a Nascar fan and competition winner, to get a behind-the-scenes look at the Daytona 500 on 'Undercover Boss' (Sun., 9PM ET on CBS).

Working with a pit crew on the Daytona Speedway, Kevin becomes a "tire scraper." While watching them work, he says, "What these guys do -- the pressure's immense ... It's a very sensory experience at the race track -- the sound's incredible, you can smell the tires and the oil and the gas."

When one car sideswipes another, chaos on the track ensues, leading to a massive pileup. Several cars catch fire, including the one his crew supports. Kevin witnesses it all firsthand, including the driver's rescue.

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