Sylvania 300

The Sylvania 300 is a NASCAR Sprint Cup Series stock car race that is 317.4 miles (510.8 km), traditionally held in mid-September at the New Hampshire Motor Speedway in Loudon, New Hampshire, the other one being the 5-hour Energy 301 in July.

The Sylvania 300 also has the distinction of being the only Sprint Cup race outside of Daytona and Talladega to run a restrictor plate race since the adoption of the current 358 cubic inch formula. After Adam Petty's fatal crash in the Busch Series practice on May 12, 2000, and Kenny Irwin, Jr.'s fatal crash in the Cup Series practice on July 7, 2000, NASCAR decided to run restrictor plates, already used for the Whelen Modified Tour races at the circuit, for the 2000 Cup race, then known as the Dura Lube 300 sponsored by Kmart. Adding restrictor plates did have the desired result of slowing down the cars drastically, but at the same time, restricted passing so much that Jeff Burton led all 300 laps. This lack of passing was so noncompetitive, that for Cup cars only, the restrictor plates were gone for the very next race, the 2001 New England 300.