Bing 15-2.5 diffuser?

henryb /

What size diffuser comes with your 15 bing? Talking with D at the moped junkyard/warehouse says the diffuser coming with the 15 bing is a 2.17. Others say 2.5... 2.22 comes with the 14, I believe. why would there be a smaller diffuser on the 15 bing? I could have things very backwards, reading other threads I was just as confused... thanks!

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