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Comparing the bulbs.
As you can see, the connectors on the standard bulb and on the controller are identical, BUT: the polarity on the connector on the car needs to be switched.
Fitting the D2S takes a little time but doesn't require any modifications to the housing. It's a tight fit, no need to worry about vibrations or randomly moving bulbs.
The controllers were padded and zip-tied to secure them in place. I didn't leave the controller behind the bulb as seen in the picture, it was moved to the left to avoid vibrations/interference with the headlight housing.
Is the light any better? Yes, by far.
Does it blind others on the road? No. As the bulbs have (almost) the same point of light emission, the pattern is as it is supposed to be.