The Ducati GP9 frame, on the other hand, is not a beam-type chassis. The steel-tube frame used on its predecessor, the GP8, bolts to the top of the engine at the front and rear cylinder heads and doesn't extend downward to the swingarm pivot. Instead, the swingarm is carried in the rear of the engine/transmission case. The case effectively replaces the beams of a more conventional frame, and the Ducati frame thus becomes a box of tubes carrying the steering head and enclosing the airbox in the "V" of the engine. This frame is perfect for composites because the carbon-fiber box duplicates the function of the steel-tube box and at the same time doubles as the airbox, reducing parts count and complexity, and providing what is almost certainly increased airbox volume.