Noise after installing new rear spring

So I replaced my rear spring on my 05 yz250 with a racetech 5.4. I used the adapter that came with it when I put my shock back together. Everything went smooth as can be EXCEPT

Now when I compress my rear suspension quickly I get a noise. Like a whuuuh in kinda a high pitch.

Has anyone else gotten this when moving to a new spring....is it just the spring getting used to the bike and the surfaces mating? I'm having a hell of a time trying to identify exactly where this sound is coming from.

Thoughts?

sometimes its the linkage, sometimes the mud flap on the airbox rubbing on the swingarm

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