A Perfect Run is a bonus that rewards you for smooth driving. You can perform a Perfect Run by not touching walls, wrecking or getting knocked down for 20 seconds. Knocking down other racers, traffic, or obliterating obstacles will not affect your Perfect Run. After 20 seconds, you will be rewarded with a small nitro bonus (25% of your nitro bar). Touching the sides of ramps and falling out of the map also will not affect your Perfect Run.