[johnyisthedevil]

you would lose the effects of scavenging. which does improve hp and torque. think of the pipes as dueling syphon guns. one helps the other draw spent gasses out and fresh mixture in. it also helps to balance out flow between cylinders since packaging constraints often dictate two completely different pipes. It would be a cool setup though and would probably have a nice top end hit, but it would sacrifice linearity somewhat.