port length

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Elbow

I'm just shooting from the hip on this one for the most part, so take that for what it's worth...

Adding an elbow in tube flow increases the head loss. Which should make sense to you intuitively. So, if there's an option of being over or under, with an elbow, I'd go for under because the elbow should actually decrease the tuning freq of the port, so the decrease in length should compensate somewhat.
 
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