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Air blowing out the filler cap is totally normal; you'll find it does exactly the same thing, even if you take the catch can off. On my 3B with no can, the filler cap hole puffs about equally as the stink tube.
That said, I put too small lines on my stin ktube once and leaked through every seal, so it definitely can happen.
Where did you plumb the line from the can into the intake? Before / after the air filter? Before / after the turbo?
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