Anyone go with solid subframe + 75D diff bushing?

[woody888]

Hello huys.

Did a lot research that most of M3 owners go with solid subframe + 95A diff bushing.

I'm wondering if anyone set with solid subframe + 75D diff bushing?

Would the 75D diff bushing make crazy whine sound?

thank you.

[pbonsalb]

Yes. 80A whines some and 95A whines more, so 75D will be worse. If you have a convertible, the extra sound deafening and reinforcements may help. I have 85A and would not go stiffer but drove a convertible once that had solid diff bushings and the whine was not too much.