Slipstream

Slipstreaming (also known as Drafting) is a technique that can be used in Mario Kart DS and Mario Kart Wii. If a player trails behind a player for a certain period of time, a ghost-line will appear in front of their kart, and give them a temporary speed boost. However, attempting this technique can be potentially dangerous if the leading racer drops an item such as a Banana or a Bob-omb behind them which the slipstreaming player would be unable to avoid.