I have a 6MT from an 07 sti that is supposedly going out. I recently took my wrx to my tuner for an inspection and they said my center diff is going out. But a lot of people seem to report clunking, popping or other just bad stuff when doing sharp turns and sometimes even just driving. The only thing I got is a loud whine and some vibration while turning. My shop quoted me $3,300 for the whole repair. The thing is it just seems to be bearings. I'm going to do this work myself, but do you guys think my center diff is bad from what I've described? If so what would y'all recommend? Are there rebuild kits available or do I just replace it. On top of that, any advice, resources, guides, and especially part numbers for the rebuild would be a big help from yall.