I noticed a clicky sound when driving slowly a few weeks ago that seemed to match speed while i had my window down but i havent heard that for a while. Thought i should mention that.
Anyway this humming sound is only audible in 1st and 2nd at low speed and eventually wind noise and the exhaust drown it out..
My gut is saying its passenger side at the front.
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Ex- Phase 3 China GTi-6 T-Reg