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I have a 2016 ecoboost and have no mufflers , resenator. I had the one cat on the stock downpipe, after getting a 3" catless downpipe installed my exhuast smells like gas fumes and white smoke every now and then at idle. Any idea why it's happening and how to fix it?
 

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What you will need to do to fix this problem is raise the idle to 950RPM. You can do this if you have a handheld tuner, which i am assuming you do because of the downpipe. You will also have to have the secondary o2 sensor deactivated or you will get a CEL.

The reason that this happens is because you removed some backpressure, just enough for a drop of oil to leak from the rear shaft seal of the turbo. Just one drop will create the smokeshow that you are seeing.
 
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