NO, the first dealer (where I bought my Legacy) does not help at all, they said it's same with other alike Legacy, no repair needed!!!
So I went to another dealer and test drive other two almost identical Legacy,
which are much much quieter than mine.
If you're 15-16 year models, the TSB# 12-185-15R should fix the B-Pillar problem. Try it.
If it does not fix your car, file the complaint on subaru and NATSA, once have enough customers have same issue, they might try to fix it,