Here's another one I just was reminded about.
Mfgs also use different size intake tubes.
So if mfg a tube is the same size as mfg b tube no adjustments should be needed. But if mfg c has a larger tube than mfg a then the tune may need tweeking. The same would go for the reverse, if mfg c tube and down sizing to mfg a tube.
Lars
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