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What's with that bar across the inside of the upper intake plenum? Does it have a purpose other than restrict flow? And why is there a butterfly valve in the intake that closes and seperates cylinders 1-3&4-6?

Also, are there any special modifications to the intake lines, etc. needed when using forced induction? Will all the lines handle positive pressure?
 
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My guess would be to split the air since the air isn't coming from the front of the intake manifold. Since the air is coming in in the middle of the 6 cylinders, you would need to split the air so that equal air gets to each cylinder. I wouldn't know why you would need to do this because if a cylinder wants air, it will suck in air. That's what I think about that.
 
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Well, the bar is horizontal. The butterfly valve is vertical between the 3rd and 4th intake runner, however. Don't see how it could be good for airflow.
 
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