At its best, NASCAR superspeedway racing is a captivating combination of speed, power and strategy. At its worst, superspeedway racing with restrictor plates on the engines is a dangerous en deavor, a catastrophe waiting to happen. The Coke Zero 400 at Daytona on Saturday night was the best and worst of NASCAR. The last four laps were spellbinding. Tony Stewart battled to hold his lead but lost it on a bold pass by Kyle Busch.