What are the hoses on these Honda throttle bodies?

Soldato
Joined
18 Oct 2002
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8,968
Location
UK
The twin pair of hoses connecting each bank, what are these for?
Is it some kind of idle control? The section between each of the pairs of throttle bodies cyl 1-2 and cyl 3-4 also looks like it has something going on there, any ideas? Just to save casting metal, or does it have a function.

https://www.ebay.com/itm/183843559058
 
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