I think the cage thing might be coincidence. You will very likely need to make an adjustment on the air fuel mixture screw. Adding the UNI changes the air flow geometry slightly even at idle. Essentially, you are pulling in more air at idle than you were before so it makes sense that your old air mixture screw setting may not cut it.
You'll just need to tinker with it to find the sweet spot. Also, the cold air will have a bearing.
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