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It has always been my understanding that the crossover tube does nothing more than help equalize the two carbs. If one is pulling a little more than the other the crossover tube will help even it out. If both your carbs are properly synced, you won't need the crossover tube. It does not give any HP gain. I haven't run a crossover intake on any of my drag bikes....but do have one on my trail bike simply because the intakes I ordered already had one machined into them.

Does that answer your question?
 

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The incoming intake charge has velocity as well. This velocity implies inertia then. As the reeds close, there is intake charge with inertia and can benefit from somewhere to go with that.

Additionally- in a 180* seperated twin- you can use the opposing pulses to help flow.
 
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