Boo Pipes

The Boo Pipes is King Boo's unlockable kart in Mario Kart: Double Dash!!. It is a gray version of Petey Piranha's Piranha Pipes, and can be unlocked by completing Special Cup in Mirror Mode. Unlike most heavyweight karts, the Boo Pipes' speed and acceleration are superb, making it a popular choice among professional players, but like heavyweight karts, the Boo Pipes is very hefty and can knock lighter karts around (tied with Piranha Pipes for second heaviest).