^So you have a bad TC mount and are waiting to change it because you want to see if it gets rid of a vibration that some guy on the internet posted about? Do you think that by ignoring a failed component it will fix itself? You didn't immediately order a TC mount when you found it to be in rough shape?
I haven't seen a bad CSB on an xi, but I assume that's caused by driving around a car with a bad TC mount. You shouldn't need to touch the CSB on a BMW that's not an e39 540 for at least 200k miles. Unless you drive around with failed mounts.