Not just regulations - simple economy. They can get more power out of a forced induction 4-cylinder for a given amount of fuel than they can out of a larger V6. The 15º V6 is being dropped as upgrading it to direct injection is too difficult - the V6 in the Passat has DI, but I believe it's also a 60º V6, and thus won't fit under the bonnet of the smaller Golf.
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